unable to send messages

Binary package hint: evolution

All my account information is correct [ mail.comcast.net / smtp.comcast.net ] and I can receive mail from my ISP server, but I cannot send any out within Evolution. If I open my web browser and use, ex. Yahoo, I can send my mail. What is the problem. There seems to be no way to check the pop ports for outgoing. I am using the latest release of Ubuntu

ProblemType: Bug
Architecture: i386
Date: Sun Feb 28 19:36:59 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/evolution
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: evolution 2.28.1-0ubuntu2
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-19.56-generic-pae
SourcePackage: evolution
Uname: Linux 2.6.31-19-generic-pae i686
XsessionErrors:
 (gnome-settings-daemon:1776): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:1809): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:1844): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-panel:1806): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -5 and height 24