The header is checked in exim to skip DKIM-signing messages
to mailing lists -- mail forwarded via lists have problems
with DKIM/DMARC and they usually sign messages themselves.
my_hdr Reply-To: Oleg Broytman <phd@phdru.name>; \
my_hdr Mail-Followup-To: Oleg Broytman <phd@phdru.name>, CheetahTemplate discussion <cheetahtemplate-discuss@lists.sourceforge.net>"
-send-hook ~u unmy_hdr Reply-To
+send-hook ~u \
+ unmy_hdr Reply-To; \
+ my_hdr X-Skip-DKIM-Sig: mailing list
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