I have a very strange problem that I am trying to figure out and solve.
I have own mail server (postfix. dovecot, roundcube etc…)
All configured correctly, (dns, dkim, rdns tls,…) all the tests I’ve done give an good result as expected.
When I send email from roundcube to gmail, everything is fine, the message is in inbox.
When I send completely the same message (same subject same body, same sender address all copy / past) with PhpList, message goes in spam.
PhpList is configured to use smtp, same as roundcube with same user. With all default config. (nothing changed)
The only difference I noticed by analyzing mail source is in headers and I try to play with phplist headers but always same result. SPAM.
How gmail recognizes that that mail is sent from phplist and why mark it as spam.
What I can do to prevent this behavior.
phplist version 3.3.3