I finally got around to upgrading from a crufty build of 1.5.18 to 1.5.20 (hg HEAD from 30 June 2010) . I run mutt on a Mac and use this line in mailcap to handle any HTML MIME parts:
text/html; cat > /tmp/mutt.html\;open /tmp/mutt.html When I message had an HTML part I wanted to view, I'd hit "v", select the HTML part, hit return, and this usage of Mac OS's "open" command would open a new tab in Safari. I no longer get that behavior in 1.5.20. Instead I get this error: [-- text/html is unsupported --] ---Attachment: text/html (all) Key is not bound. Press '?' for help. If I add "copiousoutput" to the mailcap entry, 1.5.20 behaves similarly to 1.5.18, except that mutt now automatically and sometimes unexpectedly (to me) calls "open", sending focus to Safari when I don't necessarily expect it. I'd prefer the older behavior if there's any way to get it back. Does anyone have any ideas? Thanks, Matt