Showing posts with the label cisco pix

Cisco PIX/ASA: Disable SMTP Fixup

Over on the Mailop list, a postmaster shared his tale of woe involving sending mail to a small set of recipients whose mail server is behind a Cisco PIX firewall. You can tell if a receiving site is using a Cisco PIX firewall by telnetting to port 25 of the site's MX and seeing if responds with a row of output that is almost all asterisks: 220 *******************************************…
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Receiving Duplicate List Messages?

The other day, somebody asked me what causes a recipient to receive the same message more than once. I run into duplicate message issues perhaps once or twice a year; not too often, but often enough that a recipient gets really angry at the sending ESP, assuming it's they&#…