Unable to send mails from Linux servers

Here are the steps to configure sendmail ..  In case if you notice the setup is missing on any of the servers..

keep these commands handy..

1.       Backup sendmail.mc

cp -p /etc/mail/sendmail.mc /etc/mail/sendmail.mc_orig

2.    Modify the external smtp server (uncommenting the line and updating the value )

dnl define(`SMART_HOST', `smtp.your.provider')dnl

to

define(`SMART_HOST', `mail.global.frontbridge.com')dnl

3.    Compile

make all

4.    Restart sendmail service

(OEL - 7)

systemctl start sendmail

systemctl enable sendmail

Lower versions

/etc/init.d/sendmail restart

(or)

/etc/init.d/sendmail start