[Pkg-exim4-users] Two Message-ID headers - filter out to only one?

[Andreas Metzler]

Bruce A. Bergman <bruceb at fatcity.com> wrote:
> Thanks Andreas. Actually, WHO put the headers in there is less important 
> to me than knowing how to get them out. :) I didn't honestly think about 
> whether exim4 was adding the header or not, or else I would have come to 
> the same conclusion as you, so thanks for setting that part straight.
[...]

Transports and routers have a "remove_header" seeting [1] [2], and you
can also remove header in ACLs[3].

Please note however that removing Message-ID headers indiscriminately
will break threading for clients.

cu Andreas

[1]
http://www.exim.org/exim-html-current/doc/html/spec_html/ch-generic_options_for_transports.html
[2]
http://www.exim.org/exim-html-current/doc/html/spec_html/ch-generic_options_for_routers.html
[3]
http://www.exim.org/exim-html-current/doc/html/spec_html/ch-access_control_lists.html#SECTremoveheadacl
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