were using a machine for content-scanning running NetIQ Mailmarshal SMTP. The mail is queued after DNS lookup is OK, and sending is started, but stalled after send speeds goes from 20Kb/s to 100B/s. NetIQ comes back to me with NETIQKB28987.
This is telling the text below...... Could this also be the case in WRF6.0.4 ??? The problem is there sinds i'm using that.
The cause of this issue appears to relate to the "SMTP fixup command" in the PIX firewall software, which in most cases is enabled by default. This command restricts all access to mail servers to RFC 821 commands of DATA, HELO, MAIL, NOOP, QUIT, RCPT, and RSET. Although MailMarshal, an ESMTP server, sends the message data in full, somehow the PIX firewall interferes with the 250 OK response, and this in turn makes MailMarshal believe an error has occurred, so it keeps sending the message repeatedly.
The suggested fix from Cisco is to disable the fixup protocol SMTP 25 command when using PIX with ESMTP servers like MailMarshal. You can also try upgrading the PIX firewall software to the latest version available - some customers have reported improvements after doing this. Please contact Cisco for all technical support relating to PIX firewalls.
Kerio discussion forums are intended for open communication between forum
members and may contain information and material posted by members which may
be useful in learning about Kerio products. The discussion forums are not
intended to provide technical support for any specific product. Any
information implied or expressed in the discussion forums is that of the
posting member. Kerio is in no way responsible for the information posted in
the forums, or its accuracy. Kerio employees may participate in the
discussions, but their postings do not represent an offical position of the
company on any issues raised or discussed. Kerio reserves the right to
monitor and maintain the forums to promote free and accurate exchange of