DKIM & extra headers

A *number* of my emails report bad DKIM in Thunderbird.


*Many are fine.*


Now , I know *I'll need to do a lot of legwork here* but I'd like to 
establish some fixed points before I dig deeper.


I add DKIM on my outgoing email.


I have exim filters which add various headers


My current understanding is:


     On my *outgoing* email the DKIM is added late on, so ANY 
modification I make (headers or body) inside exim will be included in 
the DKIM signature?

     On *incoming* email , I use fetchmail and invoke SMTP (exim) to 
deliver locally , here any modifications (e.g. in filters) will cause 
DKIM to break (..or is it only Body modifications?)


There an several other places, outside of exim, where this change could 
be getting made (if indeed it started with a valid DKIM) so, as I say, 
I've a lot of digging to do .



--


Graeme



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