1. Edit file sendmail.mc

$ vi /etc/mail/sendmail.mc

2. Lalu tambahkan perintah dibawah ini, dibawah baris dnl # Default Mailer setup

define(`SMART_HOST`, `relay.aktiva.co.id`)dnl

FEATURE(`authinfo`)dnl

define(`RELAY_MAILER_ARGS`, `TCP $h 587`)

3. Buat file authinfo

$ vi /etc/mail/authinfo

4. Isi dengan script berikut

AuthInfo:relay.aktiva.co.id "U:YourAccountSMTP" "I:YourAccountSMTP" "P:YourPasswordAccount" "M:LOGIN PLAIN"

5. Update Konfigurasi file sendmail

$ cd /etc/mail

$ m4 sendmail.mc > sendmail.cf

$ makemap hash authinfo < authinfo

6. Restart service sendmail

$ /etc/init.d/sendmail restart