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Topic: Sender address rejected

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version: Debian
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Jun 23 11:07:58 mx postfix/smtpd[15437]: NOQUEUE: reject: RCPT from m239-4.eu.mailgun.net[185.250.239.4]: 550 5.1.0 <bounce+303a11.3cbb-contact=***.org@***.org>: Sender address rejected: User unknown; from=<bounce+303a11.3cbb-contact=***.org@***.org> to=<contact@***.org> proto=ESMTP helo=<m239-4.eu.mailgun.net>


Hello,

i've seen other post with the same error but no answer are clear.
Is it possible to turn off sender check only for one domain ?

Thanks in advance,

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