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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.
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