==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2 MARIADB edition
- Deployed with iRedMail Easy or the downloadable installer? iRedMail Easy
- Linux/BSD distribution name and version: CentOS Linux release 7.9.2009 (Core)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Mysql
- Web server (Apache or Nginx): nginx/1.16.1
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello

We have 4 different domains on the mail server. A strange mistake began to occur today. Mail sent to xxx@domain1.com will be nicely delivered from xxx@gmail.com, but mail to xxx@domain2.com from the same gmail will not be delivered. But it happens to individual recipients. Emails sent to yyy@domain2.com will reach the recipient.

Gmail error: 554 5.7.1 <xxx@domain1.com>: Recipient address rejected: Blacklisted

Sender gmail is not blacklisted.

And maillog:
Apr  1 15:53:28 mail postfix/smtpd[8515]: NOQUEUE: reject: RCPT from mail-lf1-f52.google.com[209.85.167.52]: 554 5.7.1 <xxx@domain1.com>: Recipient address rejected: Blacklisted; from=<xxx@gmail.com> to=<xxx@domain1.com> proto=ESMTP helo=<mail-lf1-f52.google.com>

-----------------------------

Apr  1 11:24:21 mail amavis[13786]: (13786-12) Passed CLEAN, <xxx@gmail.com> -> <xxx@domain2.com>, Hits: 0.001, tag=2, tag2=6.2, kill=6.9, queued_as: 548626262E4A, L/0/0/0
Apr  1 11:24:21 mail postfix/amavis/smtp[17138]: C4F536261D01: to=<xxx@domain2.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.6, delays=0.16/0/0/1.5, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 548626262E4A)

thanks for the advice