Hello everybody,
We have a problem here, one of our users are trying to send an mail and the RCTP down´t receive. Zimbra send a msg to my user with:
Protocol error: host xxxx.xxxxxx.xx[ip.ip.ip.ip] said:
250 RCPT TO accepted (in reply to DATA command)

I can see in /var/log/zimbra.log
Jun 17 18:24:20 zimbra amavis[9946]: (09946-06) FWD via SMTP: <ggsilva@cm-arruda.pt> -> <mail_dst@mail.com>,BODY=7BIT 250 2.0.0 Ok, id=09946-06, from MTA([]:10025): 250 2.0.0 Ok: queued as 58D5538DD00
Jun 17 18:24:20 zimbra amavis[9946]: (09946-06) Passed CLEAN, LOCAL [] [] <ggsilva@cm-arruda.pt> -> <mail_dst@mail.com>, Message-ID: <4C1A5B95.8070709@cm-arruda.pt>, mail_id: MsHUTGKlw6-7, Hits: 0.581, size: 3542, queued_as: 58D5538DD00, 735 ms
Jun 17 18:24:20 zimbra postfix/smtp[7517]: 9D13738DCFF: to=<mail_dst@mail.com>, relay=[]:10024, delay=0.81, delays=0.07/0.01/0/0.73, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=09946-06, from MTA([]:10025): 250 2.0.0 Ok: queued as 58D5538DD00)
Jun 17 18:24:20 zimbra postfix/qmgr[11863]: 9D13738DCFF: removed
Jun 17 18:24:20 zimbra postfix/smtp[7520]: 58D5538DD00: to=<mail_dst@mail.com>, relay=mail.dgal.pt[]:25, delay=0.43, delays=0.08/0.01/0.33/0, dsn=4.0.0, status=deferred (host mail.dgal.pt[] refused to talk to me: 421 5.5.2 Syntax error (command line too long))

I try to send mail from other account in zimbra to other account in destination server but I get the same error...

From gmail I can send to zimbra and to destination mail without problems.

I google it and find that some exchange servers have problems with ESMTP protocol greeting.

Any one have this (command line too long) error ????

Thanks in advace