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I have a domain already setup at the MX to route all incoming mail addresses (* to one particular mailbox the ISP provides for IMAP, POP, webmail, etc.:

Tested sending TO works.

Back on my Linux Ubuntu box, using the SMTP credentials, I can already send out mail as, no problem.

Problem is, how do I send FROM an arbitrarily different address other than bubba@, but still the same domain somethingelse**? My attempts using the mail command error:

Sender address rejected: not owned by user

In my /etc/exim4/passwd.client

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up vote 0 down vote accepted

Eventually I figured it out. Not sure which change mattered most for this but:

in /etc/exim4/update-exim4.conf.conf


The ::587 wasn't obvious to me.

in /etc/exim4/passwd.client

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