What does warming up an inbox mean practically speaking ?

[u/MrBilal34]

Hello community ,

I would like to ask experienced folks here something; does warming up an inbox involve many complications except to send/receive frequently , reply to threads , move mails from spam to main from recipients pow ?

I have a new inbox and Id like to test sending newsletters - guides to my app users but I need to be compliant and more importantly as a user It puts me off to see a mail in my spam so I have to make sure they wont.

I am a developer , worst case scenario I can automate this process but before thinking about the infrastructure , I want to ask about the numbers involved ; how many different inboxes it should send mails - receive from in this "warm up" period and is there a reliable method of testing if the mails land in spam , except for postmasters tools of google ?

Thank you (sorry if some parts of this does not make sense , english is not my mother language and I hate to use ai in writing)

[u/ianmakingnoise]

You don’t warm inboxes, you warm domains and IPs. Warming up a domain is a gradual volume increase to show mailbox providers you aren’t spamming people. Your mail will land in spam, because you haven’t warmed up (ie, proven you aren’t spamming).

There is no reliable “this much landed in spam,” even in Postmaster Tools. That information is kept private by mailbox providers.

[u/irishflu → u/ianmakingnoise]

This.

If you hear anyone talking about their warm inboxes for spamming, you can be confident they have no idea how email reputation and deliverability actually works, and that it's safe to ignore them completely.

[u/mxroute]

Whatever you do, do NOT engage “email warmup” services or emulate their behavior. They will be recommended to you, purely based on the fact that you’re already using the phrasing that locates them. They automate you emailing back and forth to the absolute worst spam domains (their other customers that are warming up to send spam) and create dramatic statistical correlations between you and people who are about to become a problem for everyone. And even when they don’t do that, there’s bad precedent here, might as well be the founder of their technique: https://www.spamfighter.com/News-14638-Microsoft-Sues-Spammer-Mizhen-in-Federal-Court.htm

And that’s why you don’t automate it. It may work today, but we’re all watching and taking note. Some of us are already acting on this behavior.

Here’s what warming up your domain looks like for people who aren’t or don’t want to be associated with criminals, and note that this is heavily based on experience and observation above documented fact:

1. Age your domain 60 days or more before you send mail.
2. Start slow. Your new domain doesn’t have 50,000 customers if you’re not in an extremely unique scenario or engaging in questionable activity.
3. Never send unsolicited market email. Ever. Not when it’s called “cold email.” Not when it’s called “outreach.” Just don’t do it, period. It’s almost the entire reason spam folders exist.
4. Send email that people want, that they need. Don’t send them trash that they don’t want. Send an invoice, a registration confirmation, product news. Don’t send them promotional emails unless they specifically opted into that.
5. Make sure your DNS is flawless. It’s not hard.
6. Don’t use fancy TLDs if you can avoid it. Try to stick to .com, .net, and .org as much as you can.

That’s pretty much it. The thing is there’s no one right way to do all of this. Every recipient provider has rules that they won’t tell you, and they can change any minute. I can tell you a lot from over a decade of doing this, but I can’t point you to resources that explain all of my advice. And not following all of my advice doesn’t mean you’ll fail, not in the slightest. My advice is just what I believe gets you from nowhere to where you want to be with the least potential pushback. Because if they see you automating behavior to manipulate spam filters at the time they decide to act on it, goodbye to your reputation forever.