pdf attachments opened in external viewer

[Fourhundred Thecat]

Hello,

somehow, I got it working, that pdf attachments are opened in external
viewer (evince). That is very nice.

But, mutt waits for evince to close, before I can continue working in mutt.

This prevents me from opening multiple pdf attachments and leave them
open, while continue working in mutt.

I guess, I would have to add '&' somewhere, so that evince is opened in
background ?

But where?