|OS type and version
||CentOS Linux 7.9.2009
We have multiple domains on the server, and we want to Emails must be sent from a domain name, not from Hostname.
Your IP address 0.0.0.0 is associated with the domain xxx.domain.com .
Nevertheless your message appears to be sent from mta1.xxx.domain.com .
How we can fix this issue… So All emails are associated with the domain.
You don’t. Mail will always be sent from the servers hostname not an individually hosted domain.
It really shouldn’t attract any attention because it’s a typical setup. In terms of numbers, only a tiny percentage of domains host their own mail servers.
Is the mail server sending from a different IP than the domain’s A record? That’s also not unusual, but the DNS records have to reflect it.
update your SPF record to allow the IP and mta1.xxx.domain.com for mx
You would either need Postfix 3.4+ that supports SNI or a private IP address for each domain.
The Postfix 3.x on GhettoForge works great on CentOS / RH 7.9 and Virtualmin. I’ve been using it for well over a year without so much as a belch, fart, or hiccup.
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