I had this issue as well. Seems to be some sort of config issue. I
replaced with /etc/postfix/main.cf with a blank file, and it worked.
I did not configure it myself, but I did get a question about postfix
during my upgrade, where I selected the default selection. The upgrade
was from 20.10->21.04, so I think this might be an upgrade issue.
** Changed in: postfix (Ubuntu)
Status: Triaged => Confirmed
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https://bugs.launchpad.net/bugs/1929786
Title:
Postfix Local only configuration adds 2 dots on hostname , blocking
package upgrades
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