[Exim] rewrite rule help

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Autor: Dave C.
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A: exim-users
Assumpte: [Exim] rewrite rule help

ARGH.. I'm pulling my hair out over this.

I would like to have exim obey

deny    !verify = header_syntax


But unfortunately, we've got a number of customers with Outhouse, and
they tend to use its 'group lists', which like to use the following in a
message Bcc'd to those groups:

To: <Undisclosed Recipients:;>

which is not valid.

I have been trying to get a rewrite rile, to convert that to something
like:

To: Undisclosed Recipients: ;

which is valid RFC(2)822 "group" syntax

Ive tried a number of rules, the most recent being:

\N^<.*:;>.*$\N "Unknown : ;" tSw

I was just trying to convert it to

To: Unknown : ;

for testing, I was going to tackle extracting the relevant portion for
replacement afterwards.

However, exim appears to be completely ignoring this rule. It leaves the
header untouched, and then the header_syntax check kicks in, and the 5xx
is issued..


What am I doing wrong here?