I am thinking that it is related to bug 361565. Our network admin has set up the Squid Client so that it is no longer necessary to go through the proxy to get to the Exchange Server. Email now goes out without a problem.
(Is there some way to link or combine these two bugs and mark the original question as answered?--Mark) -- Problem Sending Mail using SMTP through Proxy https://bugs.launchpad.net/bugs/385611 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs