From the collection of uncaught bounces I'm dealing with it seems

Bugs item #925319, was opened at 2004-03-29 09:15 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=100103&aid=925319&group_id=103 Category: bounce detection Group: 2.1 (stable) Status: Open Resolution: None Priority: 5 Submitted By: Michael Cashwell (cashwell) Assigned to: Nobody/Anonymous (nobody) Summary: SMTP error code 550 not seen as bounce Initial Comment: that Mailman does not treat an unknown user account as a fatal error (despite the 5xx code). This must be a bug. It's a real headache as these clearly fatal errors constitute more than 80% of the unchaught bounces I must wade through. Here are several examples (and I have many more if you need them!): From: E500_SMTP_Mail_Service@lists.sld.tld Date: March 25, 2004 11:06:51 PM EST To: <thelist-bounces@lists.sld.tld> Subject: Returned Mail - Error During Delivery ------ Failed Recipients ------ <baduser@pop400.gsfc.nasa.gov>: Requested action not taken: mailbox unavailable. [SMTP Error Code 550] -------- Returned Mail -------- ..... From: "InterScan MSS Notification" <interscan@gao.gov> Date: March 25, 2004 11:08:25 PM EST To: <thelist-bounces@lists.sld.tld> Subject: Mail could not be delivered This message was AUTO GENERATED. Please DO NOT RESPOND to this EMAIL. Sent <<< RCPT TO:<baduser.sro@gao.gov> Received >>> 550 5.1.1 <baduser.sro@gao.gov>... user unknown Unable to deliver message to <baduser.sro@gao.gov> (and other recipients in the same domain). ..... From: "InterScan MSS Notification" <interscan@gao.gov> Date: March 25, 2004 11:08:25 PM EST To: <thelist-bounces@lists.sld.tld> Subject: Mail could not be delivered This message was AUTO GENERATED. Please DO NOT RESPOND to this EMAIL. Sent <<< RCPT TO:<baduser.nsiad@gao.gov> Received >>> 550 5.1.1 <baduser.nsiad@gao.gov>... user unknown Unable to deliver message to <baduser.nsiad@gao.gov> (and other recipients in the same domain). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=100103&aid=925319&group_id=103