Do you want to relay mails from your local sendmail server to your ISP. Just follow the below steps
Open sendmail.mc using default editor vi, edit, emacs # vi /etc/mail/sendmail.mc define(`SMART_HOST',`[smtp.yourisphost.com]') FEATUREdnl
Save the File and exit
Open the File authinfo (If not Present Create a New File).
vi /etc/mail/authinfo Add the following Line "AuthInfo:smtp.yourisphost.com "U:UsernamefromISP" "P:passwordfromISP" "M:LOGIN PLAIN"
Save the File and Exit
Just run the below commands to recreate the sendmail.cf file
# cd /etc/mail/ # m4 sendmail.mc > sendmail.cf
Make Map will recreate the database for authinfo to be used in sendmail
# makemap hash /etc/mail/authinfo < /etc/mail/authinfo
Restart the Sendmail Service and check if All's Good !!!
# /etc/init.d/sendmail restart
echo '/map authinfo AuthInfo:smtp.yourisphost.com' | /usr/sbin/sendmail -bt
Sent Mail Check in Logs
Enjoy.....
Comment if issues or modification required.
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