On delivery cache the message I'd header. Check if the message I'd is
already in the cache. If it is , drop the message. This is trvial in
procmail, but your on your own with dovecot.
Thanks for that. For the purpose of the list this recipe looks like
this - very simple:
0 Wh: msgid.lck
| formail -D 8192 msgid.cache
Put it early on in your procmail recipe file.
Regards,
Phill
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