This document describes 4 easy steps to setup your Sendmail email server as smarthost to relay on DNS Exit mail relay server for all email sending.

The mail relay service from dnsExit.com can be found at here

1. Set your authorization informations by adding following line to /etc/mail/access file:

AuthInfo:relay.dnsexit.com "U:USERNAME" "P:PASSWORD" "M:PLAIN"

   Note: Replace USERNAME and PASSWORD with the DNSEXIT mail relay username and PASSWORD.


2. Add following lines to /etc/mail/sendmail.mc (check if apropriate settings doesn't already exists):

define(`SMART_HOST', `relay.dnsexit.com')  
FEATURE(`access_db')
  
3. Update sendmail.cf and access.db files:   

# cd /etc/mail  
# m4 sendmail.mc >sendmail.cf  
# makemap hash access <access 
   

4. Reload or restart sendmail:  
# /etc/init.d/sendmail restart