Others:

There are several other light SMTP agents that do what the ssmtp program does, including esmtp, msmtp, nullmailer, and others. See the Mutt Wiki for a complete list (see section 5). Otherwise, welcome to the wonderful world of configuring mail transfer agents. That task is beyond the scope of this guide. The most useful resource for configuring postfix for the purposes of a mutt user (that is, you just need it to send mail to your ISP) is entitled ``Postfix State of Mind.'' See the Appendices for its URL.