Question

Why my email sent using another domain goes to spam?

I just installed my mail server by following tutorials below:

How to Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 16.04 How To use an SPF Record to Prevent Spoofing & Improve E-mail Reliability How To Install and Configure DKIM with Postfix on Debian Wheezy

On the server that i installed mail server, i using 2 domains (domain1 and domain2) with different record for each domain (TXT, MX, NS, A)

I test sent my email using standard PHP mail function using domain1 and that’s successfully not goes to spam to Gmail.

But, when i test sent email from domain2, the email goes to spam on Gmail, where ‘mailed-by’ on email detail is using domain1.

So, how i solve this? Thanks before …

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How did you make that your sent e-mails didn’t go to spam? I have a domain and mail server (iredmail) and all of my sent mails go to spam (gmail). Can you help me?

Does your SPF record for both domains allow the server to send mail on its behalf?