Hello I use AMG3000 v7.504 to sign emails from a specific user with an official (Trustcenter) X.509 certificate in PKCS#12 format.
Everything works fine with plain text-mails in any mail client (Outlook, Thunderbird, several Webmailers) The signature is valid.
But when I send a HTML or mulitpart mail ONLY outlook says Problem mit der Signatur! "Möglicherweise wurde der Nachrichteninhalt verändert"
(Problem with the signature: maybe the content of the email has been altered).
All the other Mail-clients still say the signature is valid.
I made sure, that no virus scanning, spam-scanning or footer-addition is done on the AMG before. So why and where should the mail body be altered?
Further I´d like to know what method AMG uses to sign emails:
either "clear sign" or "signed data" ?
And if there is a possibility to change the way it signs emails?
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