SMTP is often blocked at ISPs to prevent spammers. Use mutt and a shell script with this tip: http://faq.dabase.com/faqw.py?req=show&file=faq01.013.htp

frodo$ cat server.soltecsoftware.com.au-sendmail

#!/bin/sh

ssh server.soltecsoftware.com.au /usr/sbin/sendmail "$@"

frodo$ egrep sendmail .muttrc

set sendmail = "/home/hendry/server.soltecsoftware.com.au-sendmail"