I had a look at the code for this dialog (mail/mail-send-recv.c) and I couldn't see anything that would add this frame... I tried setting the shadow type for the scrolled window and the viewport (see around line 383) to GTK_SHADOW_NONE and this had no effect.
Maybe this is a gtk bug? Maybe related to https://launchpad.net/distros/ubuntu/+source/gtk+2.0/+bug/58659 ? ** Changed in: evolution (Ubuntu) Status: Unconfirmed => Confirmed -- Send and Receive Mail progress dialog has developed an ugly frame https://launchpad.net/bugs/58661 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
