Enable Outgoing Emails

Here's how to enable outgoing emails on your Amahi server.

Note: Make sure to use copy-paste to execute those commands. In particular, they contain back-ticks as the starting string delimiter, which can be hard to find on a keyboard!

As root:

SMTP_SERVER=your_isp_smtp_server
yum -y install sendmail-cf m4
cd /etc/mail
sed -ie "s/.*SMART_HOST.*/define(\`SMART_HOST', \`$SMTP_SERVER')dnl/" sendmail.mc
make
service sendmail restart

Make sure to replace your_isp_smtp_server on the first line with the hostname or IP address of your ISP SMTP server.

If you need to connect to the SMTP server using port 587 (TLS/STARTTLS), you'll need to do this too:

cd /etc/mail
sed -ie "s/\(.*SMART_HOST.*\)/\1\ndefine(\`RELAY_MAILER_ARGS', \`TCP \$h 587')dnl\ndefine(\`ESMTP_MAILER_ARGS', \`TCP \$h 587')dnl/" sendmail.mc
make
service sendmail restart

If you need to provide a username and password to use the SMTP server, you'll need to do this too:

SMTP_SERVER=your_isp_smtp_server
USERNAME=your_smtp_username
PASSWORD=your_smtp_password
cd /etc/mail
chmod 640 access
echo "AuthInfo:$SMTP_SERVER \"U:$USERNAME\" \"P:$PASSWORD\" \"M:PLAIN\"" >> access
makemap -r hash access.db < access
sed -ie "s/.*confAUTH_MECHANISMS.*/define(\`confAUTH_MECHANISMS', \`EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl\nFEATURE(\`authinfo',\`hash \/etc\/mail\/access')dnl/" sendmail.mc
make
service sendmail restart