On Thu, 18 Mar 1999, Stephen Sprunk wrote:
Sick of misconfigured majordomos, incessant cross-posters, and occaisional operator error?
Put in .procmailrc:
# Use a cache of Message IDs received to avoid duplicate messages # (i.e. same message posted to two [or more] mailing lists will be # delivered only once [to first matching procmail rule.) :0 Wh:.msgid.cache.lock | formail -D 8192 .msgid.cache
Beware that while Message IDs are supposed to be unique, some clients do not actually guarantee uniqueness. We run the Cyrus local delivery agent, and used to have it configured to drop duplicate message IDs. However, we had complaints from customers not getting their email from certain people and upon investigation we found that the Message IDs were being reused. So, we reluctantly disabled this feature. Those mail clients may have been updated by now, but I am certain that some remain. Also, much of the time I see duplicates on mailing lists they get new message IDs as they pass through the list mechanism so it wouldn't help you anyway in those cases. John A. Tamplin Traveller Information Services jat@LiveOnTheNet.COM 2104 West Ferry Way 256/705-7007 - FAX 256/705-7100 Huntsville, AL 35801