Admin page hard to access for very large incoming messages

[RichardTaylor]

The admin page for a message shows the full raw message.

Where there are big attachments this causes the page to load very slowly; or in extreme cases make my browser hang and give up.

There's an easy enough workround - to stop loading the page shortly after requesting it.

Ideally perhaps if say the message was over 5 MB big (whatever the figure) then the full message ought not be displayed by default.

This is an occasional issue which can be worked round, not a priority to fix, I'm reporting it as I just had to force quit my browser when it gave up on such a page.

[WilliamWDTK]

This is still an issue. I encountered it today when redelivering this message from the holding pen.