Sorry for the HTML code; I'm trying to fix it. However, I yum-installed mutt and attempted to send the following email:

Date: Sat, 25 May 2013 10:29:39 -0700
From: Mail Delivery Subsystem <MAILER-DAEMON@localhost.localdomain>
To: richard@localhost.localdomain
Subject: Warning: could not send message for past 4 hours

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    **********************************************
    **      THIS IS A WARNING MESSAGE ONLY **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************

The original message was received at Fri, 24 May 2013 22:10:06 -0700
from localhost.localdomain [127.0.0.1]

   ----- Transcript of session follows -----
<users@lists.fedoraproject.org>... Deferred: Connection timed out with smtp-mm02.fedoraproject.org.
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

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Reporting-MTA: dns; localhost.localdomain
Arrival-Date: Fri, 24 May 2013 22:10:06 -0700

Final-Recipient: RFC822; users@lists.fedoraproject.org
Action: delayed
Status: 4.4.1
Remote-MTA: DNS; smtp-mm02.fedoraproject.org
Last-Attempt-Date: Sat, 25 May 2013 10:29:38 -0700
Will-Retry-Until: Wed, 29 May 2013 22:10:06 -0700

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any ideas?