unable to receive messages from certain domains

[leocertuche]

Hi there,

We've been happily running an zcs-5.0.16_GA_2921.DEBIAN4.0.20090429055651 for more than a month. Unfortunately a few days ago we started to be unable to receive messages from a couple of domains (which we already whitelisted), we can send messages to them but not recieving them but unfortunately nothing shows up at any of the logs, so we decided to make some external test at Free online network utilities - traceroute, nslookup, automatic whois lookup, ping, finger using the "Email Dossier" tool they offer.

The results show that there's an error stablishing the SMTP connection, which we suspect, could be the root cause of our problem.

The following are the results:

SMTP session

[Contacting mail.dominio.com [1.2.3.4]...]
[Connected]
220 mail1.dominio.com ESMTP Postfix
EHLO hexillion.com
250-mail1.dominio.com
250-PIPELINING
250-SIZE 23239680
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
MAIL FROM:<HexValidEm...@hexillion.com>
250 2.1.0 Ok
RCPT TO:<usuarioval...@dominio.com>
[Timed out]

When we perform the same test against an account from a different domain (google mail in this case), the results are the following:

SMTP session

[Contacting gmail-smtp-in.l.google.com [72.14.247.27]...]
[Connected]
220 mx.google.com ESMTP 21si3356922agb.65
EHLO hexillion.com
250-mx.google.com at your service, [70.84.211.98]
250-SIZE 35651584
250-8BITMIME
250-ENHANCEDSTATUSCODES
250 PIPELINING
MAIL FROM:<HexValidEm...@hexillion.com>
250 2.1.0 OK 21si3356922agb.65
RCPT TO:<usua...@gmail.com>
250 2.1.5 OK 21si3356922agb.65
RSET
250 2.1.5 Flushed 21si3356922agb.65
QUIT
221 2.0.0 closing connection 21si3356922agb.65
[Connection closed]

We've been googling and searching on forums for this strange behavior but we've been unable to resolve it.

Thanks in advance for your kind help, which is much appreciated.

Greetings,

[veronica]

This somehow seems to be issue of blocking domain hexillion.com. There must be something getting logged to /var/log/zimbra.log

[cesarflet]

I keep the same problem ... and the same question