Mike Brudenell <mike.bruden...@york.ac.uk> (Mi 25 Jan 2017 10:53:18 CET):
…
> Hence it would be a very good idea to select the domain for the DKIM
> signature you generate based on the RFC5322.From address.

The RFC5322.From header may contain multiple addresses.
If the From: field contains more than one address, the Sender: field
*must* be present. So, I believe, you should check From: *and* Sender:

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
-- 
 SCHLITTERMANN.de ---------------------------- internet & unix support -
 Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
 gnupg encrypted messages are welcome --------------- key ID: F69376CE -
 ! key id 7CBF764A and 972EAC9F are revoked since 2015-01 ------------ -

Attachment: signature.asc
Description: Digital signature

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