In comment #9 above, 815297 is a Sourceforge bug number. The issue in launchpad is https://bugs.launchpad.net/mailman/+bug/265967 Regarding comment #11 and Mailman 3, Mailman 3 uses Python 3 and the email package, which is the source of this issue, has been almost completely rewritten for Python 3. One of the goals of the rewrite was to make the result of parsing/flattening match the original text, so I suspect this is fixed in MM 3, but I'm not certain. -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/266166 Title: Broken PGP/MIME signature of messages with attachments To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/266166/+subscriptions