When I tail maillog, I constantly see this failure message:
Aug 6 08:09:01 pbx postfix/sendmail[10413]: fatal: Recipient addresses must be specified on the command line or via the -t option
However, I can test successfully with invoking sendmail from the command prompt, and my user has a (what I believe to be) correctly configured email address in their extension settings:
Well, I got this straight from the Sangoma website, but my Mail command is filled in as “/usr/sbin/sendmail” which I believe is the postfix sendmail replacement if I’m not mistaken, but I might have misread that.
For context, I did not fill this value in; it was like this from the day I installed it.
On a whim, I decided to remove the entry and it seems to be working fine now. Curious how it got there and why it was not working as expected, but appreciate the point in the right direction @lgaetz