Hi Cory,
All the documentation I've read has said to use 'f' when filtering /
using pipes, but when I do so in the following .rc then things break.
Since this has come up more than once recently, please allow me to add
a little to Matt's response.
What "filter" means in
Flags can be any of the following:
...
f Consider the pipe as a filter.
(procmailrc(5) manpage extract) is filter in the classical unix sense --
i.e., the message goes into a "filter" program and comes out, probably
altered in some way. It gets recaptured by procmail and goes through
other recipes. That's what this paragraph from the the manpage:
Non-delivering recipes are: those that cause the output of
a program or filter to be captured back by procmail or
those that start a nesting block.
means. Here's an example.
:0 fbw
* ^content-transfer-encoding:.*quoted-printable
| mimencode -u -q
What this recipe does is this: If the incoming message has a
content-transfer-encoding header that says "quoted-printable", it
[1] passes the body only (thus the 'b' flag) into "mimencode -u -q";
[2] checks that mimencode can accept the entire message body (thus no
'i' flag);
[3] checks mimencode's exitcode - i.e., it has to wait for the
program to exit (thus the 'w' flag) -- and if it's zero,
[4] replaces the message body with the output of the "filter program",
i.e., mimencode (thus the 'f' flag).
(NOTE: if you actually include this recipe you may want to make the
action line look like this: | (mimencode -u -q; echo)
to ensure there are two newlines in a row at the end of the
message. )
So although
[a] the idea of replacing the header/body/both with the output of a
"filter" program); and
[b] the idea of "filtering out the bad mail and only forwarding the
good stuff to xxx(_at_)yyy"
both use the world "filter", they refer to, as Matt wrote, completely
different things.
hth
collin
--
Neither I nor my employer will accept any liability for any problems
or consequential loss caused by relying on this information. Sorry.
Collin Park Not a statement of my employer.
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