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Topic: Email to selective domains rejected.

Hi to all!

I am having problems after long months of using iRedMail, the server
is working perfectly as expected...then all of a sudden, most of mails
going out of the box are being rejected.

Returned mail:

                   The mail system

<someon@somewhere.com>: host
    mx.somewhere.com[X.X.X.X] said: 501 5.5.4 Syntax: RCPT
    To:<address> (in reply to RCPT TO command)
 

Log File: mail.log

Jul 26 17:51:44 mail postfix/qmgr[24373]: C6F8E2C0F50: from=<www@mydomain.com>, size=585, nrcpt=1 (queue active)
Jul 26 17:51:44 mail roundcube: User www@mydomain.com [121.54.46.22]; Message for user@otherdomain.com; 250: 2.0.0 Ok: queued as C6F8E2C0F50
Jul 26 17:51:44 mail postfix/smtpd[24570]: disconnect from localhost[127.0.0.1]
Jul 26 17:51:46 mail postfix/smtp[24594]: C6F8E2C0F50: to=<user@otherdomain.com>, relay=mx.otherdomain.com[x.x.x.x]:25, delay=1.9, delays=0.12/0.03/1.5/0.33, dsn=5.5.4, status=bounced (host mx.otherdomain.com[x.x.x.x] said: 501 5.5.4 Syntax: RCPT To:<address> (in reply to RCPT TO command))
Jul 26 17:51:47 mail postfix/cleanup[24593]: 0217D2C0FB0: message-id=<20110726095147.0217D2C0FB0@mail.mydomain.com>
Jul 26 17:51:47 mail postfix/qmgr[24373]: 0217D2C0FB0: from=<>, size=2642, nrcpt=1 (queue active)
Jul 26 17:51:47 mail postfix/bounce[24597]: C6F8E2C0F50: sender non-delivery notification: 0217D2C0FB0
Jul 26 17:51:47 mail postfix/qmgr[24373]: C6F8E2C0F50: removed
Jul 26 17:51:47 mail postfix/pipe[24598]: 0217D2C0FB0: to=<www@mydomain.com>, relay=dovecot, delay=0.09, delays=0.02/0.03/0/0.04, dsn=2.0.0, status=sent (delivered via dovecot service)
Jul 26 17:51:47 mail postfix/qmgr[24373]: 0217D2C0FB0: removed

As additional information:
1. DNS tests on both domains showed good results.
2. No changes on the Mail Server was made after the mail rejection occurs.

Thank you so munch in advance for the help I will be getting.

2

Re: Email to selective domains rejected.

nmgonzales wrote:

Jul 26 17:51:46 mail postfix/smtp[24594]: C6F8E2C0F50: to=<user@otherdomain.com>, relay=mx.otherdomain.com[x.x.x.x]:25, delay=1.9, delays=0.12/0.03/1.5/0.33, dsn=5.5.4, status=bounced (host mx.otherdomain.com[x.x.x.x] said: 501 5.5.4 Syntax: RCPT To:<address> (in reply to RCPT TO command))

It seems there's something wrong in destination server, not yours.