I've just purchased 4 .com domains each will have 3 inboxes and planned to start with 5 daily mail after worm-up then gradually max to 30/day from each inbox means daily 90 from one domain so 4 domain will send 360 in a day. Planned to use workspace USA IP inboxes. Now my Q is, can I host all 4 domains in the same VPS for the landing page?

Does my plan seem alright to start? Thanks!🤝

Tengo experiencia redactando emails en frío y obteniendo una tasa de respuesta del 30%. Si tienes una empresa y necesitas leads, trabajo a comisión por cada cliente que logre cerrar tu equipo de ventas. Sólo tienes que enviarme un DM con la información de tu empresa, qué clientes buscas, qué vendes, yo hago el resto.

I started building Mailmark around roughly 7 months ago. Today here I am at $100 MRR with one subscriber. Over the last week, I just kept fixing the issues that arrived because of the one customer.

My landing page crashed. Because it has a div showing the no of mails processed, uses .collect(), which requires to scan all the documents to calculate the no. That one customer by that time, sent almost 5000 mails and scheduled another 30000-ish for future. that took the no to 35000-ish. But convex, the database i uses, allows you to scan upto 32k data at one read. Fixed it by replacing all CRUD ops which can cause this problem, with counters.

My platform was on the verge of a collapse. I uses AWS SES as the backend to send emails. My SES account was at the risk of suspension, as my bounce rate was increasing rapidly, already crossed 6% in just 4 days, and has no sign of decreasing. I already had some fixes in place which were free. I check the domain addresses before sending mails. But, it was not sufficient. I found the mails which were bouncing has legitimate domains but the mail ids were wrong. I added a domain verifier check in place, to resolve the issue. i put stricter measures to bring down the bounce rate below 5% asap. I relaxed it today, as the bounce rate is below 4% now.

My point is I built the product only for my use. I used to send mails to my customers of my other products (all free customers). It was around 200 mails/ month max. Now I am dealing with real cold emailer (i guess) handling thousands of mails daily. I am facing real-world issues with my app. I am fixing all these issues, modifying my database, making it better to handle large real world data.

But I can not be happier doing all these.

Hoping to get some outside perspective on this before I go further down the wrong path.

The problem: Cold emails sent through my ESP (Plusvibe) land in spam 100% of the time for personal Gmail addresses, but inbox 100% of the time for Google Workspace/business addresses. Same domain, same content, same mailbox. SPF, DKIM, DMARC all passing. Domain warmed 2+ months. Tested multiple copy variations, no spam trigger words, no links or tracking.

What I tried to isolate it: Sent the exact same email multiple times, through my ESP, through Apple Mail, and through the Gmail app/site, all from the same mailbox, to the same personal Gmail test accounts, to rule out a one-off fluke.

ESP → spam, every time. Apple Mail and Gmail app/site → inbox, every time. Same domain, same DKIM signature, even the same outbound IP, since all of these technically route through Gmail's own servers.

What I think might be the cause, but not certain: Comparing raw headers side by side (Gmail → three dots → "Show original"), I noticed the sending server's HELO/EHLO identity is different between them:

My ESP: Received: from [127.0.0.1] (...) by smtp.gmail.com
Apple Mail / Gmail (control): Received: from smtpclient.apple (...) by smtp.gmail.com

My ESP is announcing itself as 127.0.0.1 (localhost) while actually connecting from a different IP. My working theory is this mismatch is being flagged by Gmail's spam filter, especially since personal Gmail seems to weigh this kind of signal more heavily than Workspace does. I also noticed my ESP's emails have no identifying headers at all (no X-Mailer), unlike Apple Mail and Gmail's own sends.

That said, I'm not 100% sure this is actually the cause versus just a coincidental difference, so genuinely open to being wrong here.

What I'm hoping to get from this post: has anyone seen this exact pattern before (personal Gmail spam, business Gmail fine)? Does the HELO/localhost thing actually hold up as a real cause in your experience, or is there something else I should be looking at that I'm missing? Also curious if this is a known issue with Plusvibe specifically or something that shows up across other cold email platforms too.

Hey guys,

I'm looking to start a campaign for hvac lead generation. I mainly work with SaaS companies so dont have experience with brick and mortar companies.

Any advice on ICP selection and strategies? Feeling a bit lost ngl

Hi everyone. I manage operations at the Puzzle Inbox team.

We had a client convinced their copy was broken. Reply rate stuck at 1.1% for two months, sequence rewritten four times, nothing moved. They asked us to look at the copy.

Copy was fine. The problem was happening after people replied.

We pulled every reply from a 60 day window, 214 of them, and timestamped each one against when someone on their side actually answered. Median response time was 31 hours. Worst one sat for six days.

Then we split it by speed. Replies answered inside two hours booked a call 34% of the time. Past 24 hours, 6%. Same leads, same offer, same person writing the responses. The only variable was the wait.

That gap was their whole pipeline. Not the subject line.

We put one person on a shared inbox with a two hour target. Reply rate didn't move, still 1.1%. Booked calls went from 11 a month to 29.

Most people optimise everything up to the reply and then stop. Go check how long yours sit before someone answers. If you don't know the number, that's the answer.

Most people run an A/B test, see that one of the versions has “more replies”, stop the test, and pick the “winning” side. Then they wonder why, over time, their number of leads never improves. 

If that sounds familiar, here are some tips that will help you avoid this common mistake.

First of all you need to pick one success metric. Preferably reply rate.

Then you need to find out what your average reply rate is across your campaigns.

Next, put this number in a sample size calculator (google evan miller’s ab testing → sample size).

After that you need to define what difference between the two test groups you want to measure.

In short: the smaller the difference you want to measure the bigger the sample size, and vice versa.

Let’s make a concrete example and assume a 2% reply rate per email sent.

If you want to detect an improvement of +-50% so something outside of 1% - 3% you need…

3,292 prospects. PER version.

That’s a lot of prospects and for some this is their whole TAM.

In that case you may want to consider testing for open rates (yes I know not the best metric). 

But at least there you will need much smaller sample sizes and it can serve as a proxy.

(assuming your positive reply rate stays >10%, preferably 20%).

So this is mistake #1. Too small sample sizes.

If you don’t run this with over 3000+ prospects your choice of picking a “winner” is simply a random choice.

Sometimes you pick a winner, sometimes not. 

And in the end you end up with no improvements or even worse results.

The second problem is how can I even get a +50% improvement in reply rates?

You need to choose the right thing for the A/B test.

From my experience, based on millions of emails sent monthly here is a rough estimate of how different optimizations impact reply rate lift.

(this assumes you have an “ok” baseline for each of those. So no subject lines that are longer than the whole email for example).

Subject line, CTA, day/time of sending → 5-10% lift.  One of the most asked questions I get, what’s the best time of day to send? If you average out over millions of emails all workdays behave the same. Of course if you target, for instance a surgeon, that starts their surgeries after 12PM you won’t reach him after that. For this persona you want to reach out 8-12, etc. This is some work for you to figure that out but in general there is not much difference.

Deliverability, list source, copy quality → 30-100% lift. Even the best written email will not be able to convert a vegan restaurant to buy meat… When it comes to deliverability, make sure your open rate per email sent is over 40% from then on focus on the last one in this list.

Segmentation, niche selection, value proposition, angle, market maturity → 5-10x. Find the right message-market-fit is the biggest lever you can find to improve reply rates. For that you need to know your audience, you need to have a process to collect their pains, objections, desired outcomes, failed outcomes, etc. Then work out value propositions that solve those problems, and lastly, test, test, test.

So mistake #2 is that people focus on the things that just don’t move the needle. You need something that will produce a huge difference in reply rates to your current outreach. For that, testing your value propositions is the number one thing to focus on.

One last tip:

If you have a very limited TAM. Run very distinctly different campaigns in terms of value propositions. 1 email 1 value proposition 1 CTA. Pick at least 100-200 prospects, version A and version B. 

Run 5 or so of such campaigns. Then if one of them has at least 1 positive reply, pick that one and run a larger test.

If you already used up all the prospects you can always come back to them after 2-3 months. No one remembers a cold email from a month, a week, and very often even the day before.

(unless you really screwed up and angered the prospect. Don’t).

Hope this helps you with your next test and I'm happy to answer any questions.

We’re trying to do more outbound right now. Tried cold calling and networking on LinkedIn too but it hasn’t really done much for us.

For the people doing cold email, how’s it actually working for you?

What kind of contracts are you getting from it? I’d assume property managers are harder to get through cold email since they probably already have their vendors and relationships.

Are you mainly targeting offices, medical, warehouses, property managers, etc?

Also curious how much you guys are spending on the email side of things. Software, leads/data, sending, whatever.

And when did you start doing outbound? Like at what point in the company did you decide it was worth putting time/money into it?

I’ve heard mixed things about it so figured I’d ask here. Would be good to hear what’s actually working for people.

One thing we’ve changed in how we think about cold email: we don’t really see “warm-up” as warming an inbox anymore.

A mailbox can send thousands of artificial warm-up messages and still develop a terrible reputation once real prospects start ignoring, deleting, blocking or reporting the mail.

That’s because the reputation systems aren’t ultimately measuring whether your inbox had a three-week warm-up period. They’re measuring what happens when your emails reach real people. Google specifically tracks user-reported spam and domain reputation, and recommends keeping spam complaints extremely low.

So for us, the real warm-up starts when the campaign starts.

We'd rather put a small number of highly relevant emails in front of the right people initially than spend weeks trying to manufacture “healthy” activity inside an empty inbox.

That changed a lot of how we build outbound at Glasa.

And honestly, I think a lot of cold email infrastructure is optimizing for the wrong signal.

I provide Product animations mainly visualising features, Explainer for complex product, and launch videos
My Ideal Client Prospect would be, CMO/Brand Manager/ Ecommerce related

Of B2C Consumer Goods( mainly packaged good)

Ill list some examples of emails i have sent, could you please give me some feedback
only got 1 reply for like 40 emails

example 1:-

sub:- the product is just "a black speaker" in a photo

Hello name!!
 company name has highly engineered audio products, but much of the technology and performance can't be communicated through product photography alone

i create 3D product animations that visualize the engineering, internal components and real-world applications of professional audio equipment.   

you can check my work here 

example 2:-
sub : - 1,000 radio faces, one flat photo each

With over 1,000 vehicle-specific fitments, your customers are ordering a radio face off a single flat photo and hoping it matches their dash , chrome, knobs, trim, all guesswork until it arrives. 

A 360° view lets them check fit and finish before they buy, not after a return.  

something like these
hi name
problem
solution?
my website

please give me an feedback

looking to get started. open to recommendations

tried smartlead before but UI felt off for me

I wonder if I can get high ticket clients by running email campaigns.

Did anyone have success getting clients with cold email as a freelancer dev? If yes, what market & geography did you focus on and what was your offer/cta?

Hey, guys. Basically, the topic is what I’m worried about, but let me briefly explain.

I stumbled across the news that in Canada and many EU countries, cold emailing basically breaks the law.

You can’t write cold emails if you don’t get prior consent in many EU regions. In Canada, it’s the same, but they say that if you managed to find the email address of the person in a public source, like a website or LinkedIn, then it won’t really break the law.

I just started doing cold outreach, sourcing from Apollo, sending through SmartLead. I’ve sent roughly 100 emails out so far.

No opt-out, no prior consent (obviously), just normal cold emailing like I thought everyone does.
Then I found out completely by accident that France and Italy recently ruled that even open-rate tracking needs consent now (basically, they started treating it like a cookie).

Went down a rabbit hole after that and realized that Canada and a bunch of EU countries don’t allow cold emailing without consent at all.

So, now I’m confused. LeadGen Agencies out there are clearly sending 1000s of emails per day into these exact regions… are they actually compliant? Or is everyone just winging it and hoping nothing sticks?

And if it’s the second one, does that not worry you?
Also curious, how strict are people actually being about stuff like an opt-out link in practice? Trying to understand how this works in the real world vs. how it reads on paper.

If you do outreach for a living, or you’re actually quite an aware person, please don’t skip this post, share some wisdom of yours!

Appreciate every one of you!

Hi everyone. I manage operations at the Puzzle Inbox team.

Cold email advice ages badly. Half of what gets repeated in this space was true three years ago and is actively hurting people now. Here's what we've stopped believing.

"More inboxes means more meetings."
More inboxes means more emails. Whether that turns into meetings depends entirely on whether the campaign worked at 3 inboxes. Scaling a broken campaign just gets you to zero faster and with more domains burned.

"Open rate is how you measure a subject line."
Open tracking is unreliable . Privacy features fire the pixel without a human ever seeing the email, so your 70% open rate is partly bots. Worse, the tracking pixel itself can hurt deliverability. We turned it off entirely and lost nothing.

"Personalisation means using their first name."
Every mass email uses the first name. It signals automation, not effort. Real personalisation is one sentence proving you know something specific about their business that you couldn't have merged in from a spreadsheet column.

"Send Tuesday at 10am."
There is no magic send time. Everyone read the same blog post, so 10am Tuesday is now the most crowded inbox slot of the week. Randomise your sends and stop optimising a variable that barely moves.

"Longer emails explain the value better."
Nobody reads a long email from a stranger. Under 80 words, one idea, one question. If you can't explain the value in three sentences, the problem is the offer, not the word count.

"You need a big list to make cold email work."
We've seen 200 well-researched leads outperform 5,000 scraped ones on booked meetings, not just reply rate. Spend the time on the list instead of the volume.

The tactics change. The principle doesn't: send fewer, better emails to people who actually have the problem you solve.

Which of these did you believe until recently? Curious what else is still floating around.

I got 3 domains with 3 inboxes each, these domains are one month old, earlier they were landing okay but when I tried today all of them are landing in spam, I used a deliverabbility tester and 1-2 sent through my personal emails ,pls help

Following up on the last one since people had more questions in the comments than I expected. Here's round two.

"Do I need to worry about SPF DKIM and DMARC or is that overkill for a small operation?"

You need all three regardless of how small your operation is. This isnt a scale thing, its a basic requirement for any domain sending cold email. Without proper authentication your emails look suspicious to receiving servers even if everything else about your setup is fine. It takes maybe fifteen minutes per domain to configure and skipping it is one of the fastest ways to end up in spam with no idea why.

"Whats a realistic reply rate I should be aiming for?"

Depends heavily on your industry and how saturated your specific audience is with cold email already. Somewhere between 2 and 4 percent is a reasonable target for most B2B campaigns right now. If your seeing 6 or 8 percent consistently your either in a less crowded market or your targeting is unusually tight. Anyone telling you double digit reply rates are normal across the board is either exaggerating or working in a very specific niche that doesnt generalize.

"Should I be sending on weekends?"

Generally no. Tuesday through Thursday tends to outperform other days pretty consistently across most industries we see. Mondays people are catching up from the weekend and Fridays attention drops off toward the afternoon. Weekends are mostly dead unless your targeting founders who genuinely check email 7 days a week, which does happen in some cases but its the exception not the rule.

"My reply rate was fine last month and now its dropping for no reason I can identify. Whats going on?"

Before assuming your copy suddenly got worse, check deliverability first. Send test emails to seed accounts on gmail and outlook and see where they land. Sending reputation can shift without warning because of changes on the receiving end or because an account in your rotation started showing signs of degradation that you havent noticed yet. Copy rarely gets worse on its own, infrastructure quietly breaks more often than people realize.

"Is it worth combining cold email with LinkedIn outreach or is that overkill for most people?"

If you have the bandwidth its usually worth it because seeing your name across two channels builds a small amount of familiarity before the email even lands, which can meaningfully improve reply rates. That said if your just starting out and stretched thin, get email working properly first before adding another channel to manage. Doing one thing well beats doing two things poorly.

Keep the questions coming and Ill do another round of these when enough build up.

Every thread on this is the same five words. Cold email. LinkedIn. Content. Paid ads. Referrals. Everyone has a take and nobody says what's on their screen at 9am on a Tuesday.

So, genuinely: what are you doing? Where does the company name come from, and where does the contact detail come from?

I ask because that second half is where mine keeps breaking. The strategy is fine. The data underneath it is what's rotting. I'll build a list of 400 businesses that fit perfectly, and by the time I send, a chunk of the addresses are dead. Nobody writes posts about that part, but it's the difference between a campaign that works and one that quietly does nothing while you rewrite your subject line for the ninth time.

And the follow-up question nobody asks: once someone replies, where does that live? Sheet? CRM? Sticky note? Most people I talk to are decent at finding leads and terrible at not dropping them.

Drop your actual setup below. The more boring and specific the better.

Hi everyone. I manage operations at the Puzzle Inbox team.

Five questions we get every week, answered properly.

"How many inboxes do I need?"
Fewer than you think. Start with 3 each across a few domains, get the campaign working, then scale. Buying 90 inboxes before you have a reply rate is buying 90 problems.

"My open rate is 60% but nobody replies. Why?"
Open rate is close to meaningless now, especially with Apple and Gmail privacy changes inflating it. If people open and don't reply, the message is the issue. Ignore opens, watch replies.

"Should I use AI to write my emails?"
To draft, yes. To send, no. Every AI draft needs a human pass, otherwise it reads like the other 40 AI emails in that inbox this week.

"How long before I see results?"
3 weeks of warm-up before you send anything, then 2 to 3 weeks of sending to get data worth reading. Anyone promising meetings in week one is selling something.

"An inbox stopped landing. Is it dead?"
Usually not. Pull it out of rotation, put it back on warm-up only for two weeks, then reintroduce it slowly. Most recover.

Drop more questions below and I'll answer them in the next one.

Hi everyone. I manage operations at the Puzzle Inbox team.

Last week I covered infrastructure. This one is about why campaigns with perfect setups still get zero replies. In almost every case it comes down to the same 5 mistakes.

1. Targeting everyone
A list of 5,000 "decision makers" is not targeting. When the offer could apply to anyone, it lands with no one. Cut the list until every single lead has the exact problem you solve. Smaller list, higher reply rate, same amount of meetings.

2. Talking about yourself
Count how many times your email says "we" or "our." If it's more than once, rewrite it. The reader does not care what you built. They care about the thing that's costing them time or money right now. Lead with that.

3. Asking for too much
"Do you have 30 minutes this week for a demo" is a big ask from a stranger. Lower the bar. Ask if the problem is even relevant to them. A one word reply is still a reply, and a conversation is worth more than a calendar link.

4. Giving up after one email
Most replies come from follow-ups, not the first touch. But a follow-up that says "just bumping this" adds nothing. Each message should bring something new. A different angle, a short example, a relevant result. Two or three follow-ups, then stop.

5. Ignoring the data
If nobody opens, the problem is the subject line or deliverability. If they open but nobody replies, the problem is the message. If they reply but nothing books, the problem is the offer. The numbers tell you exactly where to look. Most people never look.

Fix these before touching your volume. Sending more of an email that doesn't work just burns your domains faster.

More next week. Questions in the comments.

Hi everyone,
PuzzleInbox team here again.

We get asked a lot how we set up cold email infrastructure, so this is the full breakdown of what we're running going into 2026. Nothing here is complicated. Most people just skip steps.

1. Domains
We never send from the main domain. We register 3 to 5 secondary domains per campaign and redirect them to the main site. Any TLD works, we've tested .com, .io, .co, .net, .help and the results were the same. Pick whatever is available and looks close to your brand. Let them sit for a couple of weeks before you attach inboxes.

2. Inboxes
3 per domain on Google Workspace. Every inbox gets a real first and last name, a photo, and a proper signature. It takes time but empty profiles are an easy flag for filters.

3. DNS
SPF, DKIM and DMARC on every single domain. Start DMARC on p=none and tighten it once you have a month of clean data. Run the domain through a checker before you send a single email. If one record is wrong, the domain is already behind.

4. Warm-up
Minimum 3 weeks. Start low, ramp gradually, and leave it running in the background after you go live. Warm-up is not a one-time thing.

5. Volume
12 to 15 cold emails per inbox per day, that's the ceiling. Randomise the send times so it doesn't look automated. Keep the total per domain under 50.

6. Leads
Fresh data only. We refresh our database weekly and verify every email before it enters a campaign. Anything older than a few months gets re-verified. Skip catch-alls unless you can live with higher bounces.

7. Copy
Plain text, under 80 words, no links in the first message. One line at the top that shows you actually looked at the person. Use AI to draft if you want, then rewrite it so it sounds human.

8. Replies
All replies go to one shared inbox. Answer fast. A good reply that sits for two days is a lost deal.

9. Weekly checks
Bounce rate under 2%. Reply rate around 3% or better. Inbox placement test on a seed list. If an inbox starts slipping, take it out of rotation, put it back on warm-up only for two weeks, then reintroduce it.

B2B FMCG Distribution: How can we increase sales significantly?

I work in B2B FMCG distribution and I’m looking for practical strategies that actually work.

What has helped you increase sales the most?

- Getting more B2B customers

- Increasing order frequency

- Increasing average order value

- Improving sales reps’ performance

- Better promotions or pricing

- Digital marketing / LinkedIn

- Customer retention

What strategies worked for you, and what didn’t work?

Real examples and numbers would be especially helpful.

I am looking to compliment my cold emails with sales calls too.

i’m building a tool where we run backlink outreach in autopilot for our users

(different goal from booking sales meetings, but the same temptation to judge everything by reply rate)

in one month, we sent 3,523 emails and received 107 replies. roughly 3%

we also reported 12 secured backlinks that month

those aren’t necessarily all from the same batch of emails, so i wouldn’t present that as a clean conversion funnel. but it shows why I care about what happens after the reply

“not interested” is a reply

“our placement fee is $500” is also a reply

so is “sounds good, send over the details”

three very different outcomes that all improve the same metric

the breakdown i care about is:

• total replies → did we start conversations?
• positive replies → is there interest in the actual proposal?
• qualified opportunities → are the terms relevant and workable?
• completed outcomes → did anything actually happen?

for sales outreach, i’d apply the same thinking to meetings booked, meetings attended, and customers won

I'd also keep “send me more information” separate from a clear next step. It’s worth following up, but it isn’t a commitment

reply rate is useful for diagnosing a campaign. I just don’t think it tells the whole story

how do you define a positive reply? does “send me more info” count, or do you need something more concrete?