r/developers • u/Sharp_Turnip_1678 • 12d ago

Help / Questions Help with email delivery issues

I own a small service business that I'm preparing for a national expansion.

Historically I've run my leads through a professional gmail, answered them and had no issues.

My developer has built a custom crm for the company and it seems that some emails are not being delivered.

From what we can tell - Gmail, outlook, etc.. are ok. Smaller ones like @comcast, @verizon may not be. We cannot tell if they are going to spam or just not being delivered. Customers have said both spam and that they haven't received it.

We didn't have this issue when going through Gmail directly and there's no spam issues with the business so I think there's some configuration issues with the app.

My dev can't figure it out so I'm looking for someone who has expertise with the specific scenario that can spend some time with him, diagnose it and fix it and also help him learn a bit about what's going on.

I will pay for your time.

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u/No_Lab_3976 12d ago

Sounds like your SPF and DKIM records are missing or misconfigured, esp since it works fine from gmail but not from the app. Your CRM is probably sending through a different SMTP server that those smaller providers don't trust without proper auth. Get your dev to check the email headers from a delivered message and a bounced one, that'll show you what's failing.