[Harald Meland]

[Jerry Adlersfluegel]

...

Is it possible that there is a limit to how many recipients my sendmail is seeing?

If no one else fills me in on the sendmail config details, I'll try checking my bat book on Monday (or when I get the chance) and report any relevant findings.

Bat book checked and found outdated, so I checked Dejanews, and from hints found there I got this:

From the sendmail-8.9.0 cf/README file:

: +--------------------------------+ : | TWEAKING CONFIGURATION OPTIONS | : +--------------------------------+ : [...] : M4 Variable Name Configuration Description & [Default] : ================ ============= ======================= : confMAX_RCPTS_PER_MESSAGE MaxRecipientsPerMessage : [infinite] If set, allow no more than : the specified number of recipients in : an SMTP envelope. Further recipients : receive a 452 error code (i.e., they : are deferred for the next delivery : attempt).

If you're running some sendmail version earlier than 8.9.0, I'd guess you could emulate this new option with some fancy stuff in e.g. the check_rcpt ruleset (but I'm not a sendmail guru, so don't take my word for it).

Could you "grep MaxRecipientsPerMessage sendmail.cf" and let us know if my guess is anywhere near the solution to the problem, so that Mailman can include hints on checking this sendmail setting for other users with similar problems?

Harald