GpgOL: Improve handling of mailman modified mails
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Description

Originally reported in the Forum: https://wald.intevation.org/forum/message.php?msg_id=6033

The problem is that the Mailing list modifies the mail and changes it from "multipart/signed" to multipart/mixed with the signed contents embedded. GpgOL does not look at "multipart/mixed" mails at all so this is currently not handled.

An example mail:

Details

Version
master

The problem is complicated because we would have to parse each multipart/mixed mail before we can know that the mime structure looks that way.

Currently we decide on a level above the actual parsing if GpgOL "touches" a Mail based on the top level MIME type.