[MlMt] How can I delete attachments of a message

[leo]

Hi there

I am pretty sure I have done this before, but I cannot figure it out 
now:

How do I delete attachments of a message? I think in IMAP this involves 
copying the message without entattchments and deleting the old one, but 
I don’t know how to do it in MailMate.

Many thanks for any pointers,
Leo