I've just installed the latest version of iredmail (1.6.1) to ubuntu22/nginx.
This server also runs the basic obzor.lt website. I need several emails like postmaster@obzor.lt.

Currently PTR record is obzor.lt - is it correct?
FQDN is mail.obzor.lt - is it correct, or it should be obzor.lt?

I'm confused by this installation step (screen attached). It was the reason why the hostname was set to mail.obzor.lt - I wanted to specify obzor.lt as the first email domain name.

> host obzor.lt returns
obzor.lt has address 157.90.0.217
obzor.lt mail is handled by 1 mail.obzor.lt.

I receive all the mail to postmaster@obzor.lt successfully (at least it works through this email and a couple of other emails on gmail).

I want to send and receive emails for postmaster@obzor.lt from my main gmail account. For that I was able to add "send email as" with mail.obzor.lt 587 in gmail settings. But when I try to send email as postmaster@obzor.lt, it simply does not work.

Also I can not set up "check email from other accounts" with pop3 - what should be pop3 server, is it mail.obzor.lt?

The last quesion - when mail send is failed, I get a return-delivery message from root@mail.obzor.lt - should not it be root@obzor.lt?