IF you use mutt WITH popmail.real-time.com, you will have to make sure that the imap feature is compiled and optional ssl enabled.
You should have the following settings in your .muttrc file.
set imap_user="username" (replace username with real username/login name)
Enter mutt -v and you should see the following:
% mutt -v
Mutt 126.96.36.199i (2000-07-28)
Copyright (C) 1996-2000 Michael R. Elkins and others.
Mutt comes with ABSOLUTELY NO WARRANTY; for details type `mutt -vv'.
Mutt is free software, and you are welcome to redistribute it
under certain conditions; type `mutt -vv' for details.
System: Linux 2.4.18-realtime.4 [using slang 10404]
-HOMESPOOL -USE_SETGID -USE_DOTLOCK +USE_FCNTL -USE_FLOCK
+USE_IMAP +USE_GSS +USE_SSL +USE_POP +HAVE_REGCOMP -USE_GNU_REGEX +HAVE_COLOR +HAVE_PGP -BUFFY_SIZE -EXACT_ADDRESS +ENABLE_NLS
To contact the developers, please mail to <firstname.lastname@example.org>.
To report a bug, please use the muttbug utility.
Look for the +USE_IMAP and +USE_SSL features which allow for secure links (recommended)
Hit Enter to download your messages from popmail.real-time.com
Hit o to accept the SSL Certificate
Enter your password
Your inbox is now accessible and ready for you to read your email
*** IMPORTANT *** when sending email this assumes you have your MTA (sendmail, exim, postfix, qmail, etc...) configured correctly to deliver the mail!