[Mailman-Developers] Testing different email structures with MUAs

[Stephen J. Turnbull]

Abhilash Raj writes:

 > I have attached all 3 type of message, each in a different file. Please
 > can you place it in your maildir and check how your MUAs respond to it
 > and report here? The message signature will not be verified(the
 > signature text is actually gibberish), this experiment is just to check
 > how the MUAs handle the message with such a structure.

I don't understand what you think you will learn from this experiment.
We're not interested (for your purposes) in what MUAs do with broken
messages, including those that can't be validated.  Your code simply
should never emit them.  (OTOH, we are interested in what your code
will do with broken messages: it should trap them.)

In particular, in most cases the MUA will parse the multipart
structures and tell you what they've found in one way or another.
This is true of signed message parts.  It's not unreasonable to
suppose that some messages will contain additional content after the
signed part; the MUA needs to determine the boundaries of the part in
any case.