Why is the server not accepting mail from other users?

Question

PHP

Good afternoon. I use FASTPANEL on the server, I pick up mail, I register a postal address for the type: [email protected] I manage mail using Roundcube. I enter the created [email protected] mailbox via Roundcube, I try to send a letter to someone - it is sent without problems, the letter arrives, but if the following error pops up in response to send a letter to [email protected]:

SMTP error from remote mail server after RCPT TO::
host eforward2.registrar-servers.com [162.255.118.52]:
554 5.7.1 : Relay access denied

The mail.log entries are:

Feb 4 09:08:19 mydomen dovecot: imap-login: Login: user=, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=214905, secured, session=
Feb 4 09:08:19 mydomen dovecot: imap([email protected])<214905>: Logged out in=50 out=546 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0

I understand that the server itself does not accept mail from unauthorized users? How to make it accept letters from everyone? Postfix is ​​not installed on the server, only dovecot.

Answer 1

Answer 2

Postfix is ​​not installed on the server, only dovecot.

Install and configure postfix, at the same time do not forget to set up MX and PTR records with your domain registrar, otherwise most servers will accept letters from your server as spam.
It is also useful to read the manuals.