Hi all,
My mailserver / DNS records are driving me crazy :(
I have a mailserver setup like mail.domainA.com and mx2.domainA.com.
All mails that are like user@domainA.com (TLD same as mailserver) are delivered properly and not marked as spam.
I have set SPF records accordingly and everything is working fine.
Of course I have also set a PTR record for the mailserver itself to mail.domainA.com.
Now I want to host a mailbox for my other domain, let's call it just domainB.com
I have set the MX-records for domainB.com to mail.domainA.com and mx2.domainA.com, just like my working mailbox.
SPF records are also the same as on domainA.com and there should be no problem from my understanding.
However, all mails that are being sent with the address user@domainB.com are being marked as spam in the recipients mailbox.
Is there something that I am missing, or did I just not understand how mailserver setups are supposed to work?
There is no difference in the DNS configuration except the domain name itself.
But this should not cause any issues, should it?