On Fri, Mar 1, 2013 at 7:25 PM, Steve Litt slitt@troubleshooters.com wrote:
It's doubtful that the OCLUG's defaulting replies to "list" (characterized by some as "munging") is the root cause here, because probably 90% of the mailing lists I'm on default replies to the list, and this symptom happens only with OCLUG's list.
It would probably go away if we changed the mailman.oclug.org CNAME into an A record. When sendmail receives an email to a domain it's authoritative for (mailman.oclug.org) and it determines that the domain is a CNAME, internally it switches to calling it the A record that it points to, which in this case is penguin.oclug.org. This is why some places have penguin dot and others have mailman dot.
It seems that your MUA is being extremely clever and detecting the different addresses, noticing that they are different, and deciding to send it to both of them. It also reminds me very much of mutt with its Reply versus Reply-All versus List-Reply capabilities, in that Claws is trying to read your mind and figure out what you want instead of just following the email (i.e. Reply-To is explicitly set, which munges anything else for most other clients).
...Todd
The total budget at all receivers for solving senders' problems is $0. If you want them to accept your mail and manage it the way you want, send it the way the spec says to. --John Levine