Duplicate Messages
Since we use the Postfix mail
transport agent, it handles alias expansion in a non-centralized fashion.
Due to how it handles aliases it never has a full view of all the
recipients to prune duplicate entries. A solution to fixing this problem
is to use procmail.
Procmail stores a configuration file in ~/.procmailrc.
Procmail can be used to
filter email. In this case, create a ~/.procmailrc and
add the text below:
MAILDIR=$HOME/mail
:0 Wh: msgid.lock
| formail -D 8192 .msgid.cache
Then, type the commands:
mkdir ~/mail # if ~/mail does not exist
chmod 700 ~/mail # highly recommended
touch ~/mail/.msgid.cache
This causes procmail to use the formail program to keep track of the
last 8192 'Message-Id:' headers and make sure messages that have been
seen do not end up in the INBOX or processed by the rest of the rules
in the procmailrc file.
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