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I confirm adding --force-mdc to Enigmail option did the job, recipients are now able to decrypt messages. Thanks a lot!

Thank you Patrick, I will give it a try!

Hello, I'm looking for help on a very specific issue. I'm using Enigmail 2.0.7 for Thunderbird (not the latest version I know, but I cannot upgraded for company policy reasons). On some occasions I have to send messages to a mailing list, and I need to encrypt messages for the recipients. So I have a pgprule set in Enigmail with all recipient keys, so when I am sending a message to the mailing list address, it gets encrypted and signed for all recipients individually. It does work (messages are successfully...