Brian Inglis <Brian.Inglis@xxxxxxx> writes: > What did you do before the bug happened? (Steps to reproduce your issue) > git format-patch --inline ... --to=linux-man@xxxxxxxxxxxxxxx This is documented to use multipart/mixed attachement with "Content-Disposition: inline". > git format-patch --no-attach ... --to=linux-man@xxxxxxxxxxxxxxx This should be the default, text/plain patch contained inline in the message. > git send-email ... --to=linux-man@xxxxxxxxxxxxxxx It is unclera what ... hides on this command line, but if you sent output from both of the above two format-patch invocations, then the output from the first invocation of format-patch with --inline would be MIME multipart messages, so it is understandable if the recipient sees such messages.