How to send as postmaster?

[psychofaktory]

Hello,

my PMiaB server is incorrectly listed on a DNSBL.

To remove it from the list, the list operator only accepts emails from postmaster@[domain.tld].

But I could not find a way to send an email as postmaster.

How to send an email as postmaster@[domain.tld] with Mail-In-A-Box?

[ddavness]

The postmaster alias is automatically configured and linked to administrator@box.example.com, which in turn is usually aliased to the first admin account created for the box. You'll need to configure the entity on your own mail client to send as postmaster (use the admin account credentials on the SMTP configuration).

To do this on Roundcube Webmail (https://box.example.com/mail):

• Login with your admin account (the one postmaster@ is aliased to);
• Go to Settings > Identities > New and fill in the form (Only the Email part is necessary), then click Save

• When composing messages, click on the "From" field, and you'll see the option to send as postmaster:

[psychofaktory]

Tried this, but it didn't work for me.

Here's my scenario: I have a domain "domain.tld". My MiaB-Server has the subdomain "mail.domain.tld". The first user i created is "user@domain.tld". This user has admin prvilege. In the alias configuration page in the admin panel "postmaster@mail.domain.tld" is linked to "administrator@mail.domain.tld" There is also the adress "postmaster@domain.tld" linked to "administrator@mail.domain.tld". "administrator@mail.domain.tld" in turn is linked to "user@domain.tld".

Then I set up the identidy "postmaster@mail.domain.tld" for "user@domain.tld" in RoundCube webpanel. I also set up the identidy "postmaster@domain.tld" for "user@domain.tld".

If I try to send from "user@domain.tld" with its alias "postmaster@domain.tld" everything is fine. But If i try to send from "user@domain.tld" with its alias "postmaster@mail.domain.tld" the following error is show in a popup: SMTP Fehler (553): Der Empfänger "mailbox@externaldomain.tld" konnte nicht gesetzt werden (5.7.1 <postmaster@mail.domain.tld>: Sender address rejected: not owned by user user@domain.tld).

[psychofaktory]

Seems that I found the answer myself.

In admin control panel I saw that I set up a Domain Alias for "@domain.tld" linked to "user@domain.tld" before. Thus I tried to create a Domain Alias for "@mail.domain.tld" linked to "user@domain.tld", too. After that sending with the identidy "postmaster@mail.domain.tld" from "user@domain.tld" worked for me.