要在 SDF 使用电子邮箱，你需要用已验证的用户账号。
默认的电子邮箱地址是你的 SDF 用户名，域名则是 sdf.org。例：ldbeth 的邮箱地址是 ldbeth@sdf.org。
在 SDF 可用的邮件程序有很多，它们的操作方式都差不多。包括但不限于：
mailx System 7 standard mail client. Very minimal, but
quick and useful. You could use it from a teletype.
rmail (emacs -f rmail) East Coast mail / babyl reader
pine West Coast mail reader. Actually incorporates MM
(from TOPS-20) as its core, though you'd probably
never know that. Slow, but user friendly.
alpine A complete recode of pine. Supposed to fix all of
pines problems but probably just makes new ones.
elm A simple and easy mail reader. Though, has a tendancy
to barf on MIME encoded attachments.
mutt A stripped down version of elm, but with better
support for MIME encoded attachments.
nmh A powerful message handling system consists a
collection of simple single-purpose programs.
nmh 是由一组命令组成的邮件用户端。inc 收取邮件，scan 显示收到的邮件，comp 会调用编辑器来写新邮件，rmm 来删除邮件。
当然，你也可以用 GNU Emacs 来收发邮件。