Here’s the idea behind mailwrapper, folks. I hope you’re familar enough with UNIX to understand this. ;)

18:04 [macoontosh] ~/%grep newaliases /etc/mail/mailer.conf

1. newaliases /usr/sbin/sendmail.real
   newaliases /usr/sbin/ssmtp
   18:04 [macoontosh] ~/%ls -l /usr/bin/newaliases
   lrwxr-xr-x 1 root wheel 21 May 26 17:44 /usr/bin/newaliases -> /usr/sbin/mailwrapper
   18:04 [macoontosh] ~/%newaliases
   newaliases: Aliases are not used in sSMTP
   18:04 [macoontosh] ~/%

You define the command to be executed for the wrapped name in ‘mailer.conf’, then you setup the symlink, and finally, test it. Note that a hash mark at the beginning of a statement denotes the line as a comment.

Easy, huh?