I attempted to upgrade a working mail server from Ubuntu 14.04 to 18.04, and cant work out what is causing failures related to the sender: field being populated with "...localhost.localdomain" in the upgraded system. (The old system works fine)
I have, among others, the following settings
mydomain = networksavvy.org
myhostname = mail.networksavvy.org
myorigin = $myhostname
Some emails appear to be sent OK, and some appear to be receiving, but I suspect that the issue has to do with virtualhosts.
An example highlighting the issue: I set up email address on another mail system to forward from an off-site server back to this server. When I send an email to that address, the second server accepts the mail, but fails to forward it on. When I look at the mail queue I see the following line, which I am fairly sure is representative of the problem:
sender: SRS0=tFlT=XJ=mydomain.com=duser@localhost.localdomain
however the following also exist
original_recipient: addr@system2.com
recipient: user@domain.com
From: user@mydomain.com
The error when the remote mail server tries to send email back is
Status: host mail.mydomain.com[X.X.X.X] said: 450 4.1.8 <SRS0=tFlT=XJ=networksavvy.org=user@localhost.localdomain>: Sender address rejected: Domain not found (in reply to RCPT TO command)
Edit: I do note that I am running postsrsd, and wonder if this relates to anything.
Questions:
- Where does the sender: field come into things?
- How can I fix this?
