I was having trouble with Mail freezing with every other message that I would read or delete, but haven’t had a problem with sending. Have you tried to remove and re-add the SMTP server for outbound mail (or the Exchange account if that’s what’s being used). > On Oct 22, 2014, at 9:10 AM, Kim Geiger <[log in to unmask]> wrote: > > I've got a user who upgraded and now his Mail app will not send. Nothing happens; the mail just sits there. When using our own mail server for outbound, I see no errors there. It's like Mail isn't even trying. > > Has anyone seen this behavior? > > -- > Kim Geiger > WKAR Radio & Television, WKAR.org > East Lansing, Michigan > 517-884-4766