New comment by thimc on mblaze repository

https://github.com/leahneukirchen/mblaze/pull/259#issuecomment-2336619596

Comment:
We may as well document that it is possible to attach files using the provided syntax in mmime(1):

`#content/type[#content-disposition] path[>filename]`

The only issue with this type of attachment is that the tilde does not seem to be supported and that you are forced to specify the MIME. So perhaps it is worth noting that if adding a Attach header is not what you want for whatever reason one could refer to the mmime manual?