Switch on "edit_headers" in your muttrc, write a Mail containing a Lines-Header, e. g. | From: <fromname> | To: <toname> | Lines: 10 save, exit your editor and see the segfault: | "/tmp/mutt-sanacht-23229-1" 4L, 41C written | Segmentation fault | chris@sanacht chris $
I've verified this is still true in 1.5.5.1 and submitted the bug upstream.
Created attachment 23824 [details, diff] Potential fix This patch appears to resolve the segfault, though I'm not 100% confident that there aren't other lurking issues with specifying a Lines: header.