On 11/23/20 9:18 AM, D'Arcy Cain wrote: > On 11/23/20 9:49 AM, maciejm wrote: >> Hi >> Thanks for replay I found "RFC 822 Message-ID is not required" >> Probably "problem" is in configurations in some clients. > > I used to have a client who was not getting emails from one of his friends. > Turned out that the friend's client/MUA was not adding the message ID. > After the first message was accepted all of the rest were silently dropped > as duplicates due to a very standard procmail recipe: > > :0 Wh: msgid.lock > | formail -D 65536 $HOME/.msgid.cache > > In other words, the message ID "" was considered a duplicate after the first > one.
The lesson from which is, don't make message delivery dependent upon an optional header. -- Phil Stracchino Babylon Communications ph...@caerllewys.net p...@co.ordinate.org Landline: +1.603.293.8485 Mobile: +1.603.998.6958
