I think many people using ssmtp would also make use of revaliases, and it would be cool if you could offer debconf addition of these aliases, say as many as the user wants. I tried many different options in mutt, and tried changing /etc/email-addresses (left over from exim install) and different rewrite options etc. in ssmtp.conf before finally reading the man page for ssmtp.
close 126563 Matt.