Procmailrc, TRAP and LASTFOLDER
I use procmail and
lbdb.
lbdb is invoked at the beginning of procmailrc harvesting
From: addresses
from all incoming mail, so that they can later be queried with mutt. It's
really neat.
However, if it's put at the beginning of procmailrc, it harvests From addresses
from spam, too. This causes the ldbd databse to become very big, slow to
query, and in some unlucky cases, to return lots of bad results.
Problem is, I run the spam filter AFTER I delivered to the mailing lists. The
rationale is that mailing lists already do their own spam filtering to some
useable level. At least those I'm subscribed to.
So, my current procmailrc goes like:
feed a copy through lbdb
filter list 1
filter list 2
...
filter list N for N very big
filter out spam
deliver to inbox
Now, is there a way I could invoke
lbdb for every mail except what is caught
by the spam filter? A way, I mean, that doesn't involve hooking into each and
every of the N list rules an
lbdb invocation?
Here is the way. In
.procmailrc, add:
TRAP=~/bin/scan-nonspam
Then write
~/bin/scan-nonspam:
#!/bin/bash
if [ $ LASTFOLDER:0:4 != 'spam' ]
then
/usr/bin/lbdb-fetchaddr
fi
exit 0
For reference, this is the documentation of
TRAP:
When procmail terminates of its own accord and not because it
received a signal, it will execute the contents of this variable. A
copy of the mail can be read from stdin. Any output produced by this
command will be appended to $LOGFILE. Possible uses for TRAP are:
removal of temporary files, logging customised abstracts, etc. See
also EXITCODE and LOGABSTRACT.
And this is the documentation of
LASTFOLDER:
This variable is assigned to by procmail whenever it is delivering to a
folder or program. It always contains the name of the last file (or program)
procmail delivered to. If the last delivery was to several directory folders
together then $LASTFOLDER will contain the hardlinked filenames as a space
separated list.
