-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Mon, Feb 05, 2018 at 09:44:43AM -0500, The Wanderer wrote: > On 2018-02-05 at 09:32, David Wright wrote:
[...] > > :0 Wh: $HOME/msgid.lock > > | formail -D 199999 $HOME/msgid.cache > > > > I used it for years. > > I don't parse this well enough to understand what it would do, and I > don't know where to find a procmail reference which would let me read up > on it easily enough to understand quickly. Could you clarify? The trick is in formail (contained in the package procmail). Formail is a pretty generic mail parser which can be used to filter mails (or parts of mails) according to different criteria. Option -D instructs it to set up a Message-ID cache to drop duplicate mails (duplicate in the sense of Message-ID, that is). The number after the -D limits the cache's length. As a careful guy, I have this: :0 Whc: msgid.lock | formail -D 8192 ~/.procmail/msgid.cache :0 a: duplicates The 'c' in the first recipe lets a copy "pass through". The second rule triggers on successful execution of the first one (i.e. a cache hit, "this was a duplicate") and drops the duplicate into the mailbox duplicates, where I can check whether something went wrong. Needless to say, I haven't had to check in the last ten years, but disk space is cheap :) Cheers - -- tomás -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlp4c5cACgkQBcgs9XrR2ka+bgCfd/ZKJyaLEAqNNgDHtMcs+a43 jE4An1QkauXZ10+quCxvwIY1nBskMtM9 =YnjT -----END PGP SIGNATURE-----
