On 2019-04-09 23:19, Zhiliang Hu wrote:
I am using a recipe to catch the email address in "From: " line
to build a "white list", with this to extract the address:
FROM=`formail -zX From: | formail -c -rt -xTo:`
or FROM=`formail -zX From: | formail -zrx To:`
or FROM=`formail -rtzxTo:`
procmailex mentions: FROM='formail -rt -xTo:'
Test your expressions:
echo -en 'From foo1\nFrom: foo2\nTo: bar\nCc: baz\n' |formail -rt -xTo:
foo2
it works fine for some of the time, but once a while it ends up with
a "foo@bar". I wonder why... (is it sometimes the top of the "From " line?)
See also https://rvtol.home.xs4all.nl/procmail/basic/pm/
which doesn't use formail.
Be prepared to handle encoded headers (base64, quoted-printable).
(see the pure-procmail-decoders, or MIME in procmailex)
procmailex also mentions:
DEFAULT=|
which is good for debugging.
-- Greetings, Ruud
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