sSMTP发送邮件

$ sudo apt-get install ssmtp

$ cat /etc/ssmtp/revaliases
# sSMTP aliases
#
# Format:   local_account:outgoing_address:mailhub
#
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.
nagios:no-reply@example.com:mail.example.com:587
root:no-reply@example.com:mail.example.com:587

$ #
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
root=<your-email@example.com>
# The place where the mail goes. The actual machine name is required no
# MX records are consulted. Commonly mailhosts are named mail.domain.com
mailhub=<mail.example.com>
# Where will the mail seem to come from?
#rewriteDomain=
# The full hostname
hostname=<mail.example.com>
# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# NO - Use the system generated From: address
FromLineOverride=YES
UseSTARTTLS=yes
UseTLS=yes
AuthUser=<your-domain/username>
AuthPass=<your-passwd>

$ /usr/sbin/sendmail -t -F your-domain-name <<EOF
SUBJECT: $YOUR-SUBJECT
TO: A@example.com,B@example.com
MIME-VERSION: 1.0
Content-type: text/plain
$YOUR-MAIL-BODY

EOF