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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