bug#48160: Mumi renders huge messages

This is now fixed with mumi commit ca4d83865943f2851b07deaf34b026705c46dd41. The problem here was that the attachment did not come with a content-disposition header reporting the size of the attachment. As a fall back mumi now also looks at the actual size of the message when determining whether

bug#48160: Mumi renders huge messages

...when it should probably give up sooner, clearly indicate truncation, and point users to the raw view. is a >9 MiB mail. The rendered HTML is >11 MiB. Apart from being A Bit Much to send to clients, I get 504s most of the time. It succeeded once. Mailm