Last Postfix, almost ready

Help! (Home for newbies)
1
SYSTEM INFORMATION
OS type and version Ubuntu 22.04
Virtualmin version 7

Sorry to ask here but there seems to not be any Postfix forum out there.

My Postfix is up and running as it should but there is one thing I dont understand how to manage.
I have a vps with 1 domain and a subdomain. Mail from the domain is no problem but mail from the subdomain gets blocked as unauthrized. I suspect it is a setting in the General options but I cant figure out where. This piece: What domain to use in outbound mail seems to be the one but I dont know the correct setting.
Anyone have the answer?

TIA
Anders

2

No. That’s absolutely not it.

You need to look in the mail log (or the journal for the postfix unit) for what’s happening to your mail and why.

3

Does the subdomain have real mailboxes or are you using something like php mailer?

If it’s php mailer, google made some changes to fight spam about 2 months ago. Now if you want to send something like an automatic reply from no-reply@example.com , you actually need to create that mailbox or it will get rejected as unauthorized

4

I finally found the problem with help from ChatGpt, believe it. It was a broken opendkim systemd file. After regenerating it, all started to work

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