Learn how to fix the Sendmail No Local Mailer Defined error. Our Sendmail Support team is here to help you with your questions and concerns.

Sendmail No Local Mailer Defined | Troubleshooting

Many operating systems come with programs to manage local mail delivery, and Unix variants are just the same.

However, if you have been running into the “No local mailer defined” error message, our experts are here to help.

Today, we are going to take a look at how to configure local mailers.

Unlike some Unix variants where local delivery programs are included in the sendmail binary, others need the local mailer to be defined clearly.

In other words, we have to define the LOCAL_MAILER_DEF in the sendmail.m4 file.

For example, if we want to use the popular deliver program we have to set LOCAL_MAILER_DEF to mailers.linux.

Furthermore, we have to install the mailers.linux file in the directory pointed to by LIBDIR. This file will define the delivery program in the internal Mlocal mailer and make sure that sendmail handles mail correctly for the local system.

Alternatively, we can proceed manually by editing the /etc/mail/sendmail.cf file to include this line:

Mlocal, P=/usr/bin/procmail, F=lsDFMAw5:/|@qSPfhn9, S=1,R=2,T=DNS/RFC822/X-Unix, A=procmail -Y -a $h -d $u

Troubleshooting Steps

If we still run into an error, our experts recommend the following troubleshooting steps:

1. Stop the iptables service on Red Hat systems with this command:

   service iptables stop
2. Try restarting sendmail with this command:

   service sendmail restart
3. Next, try recompiling the configuration file:

   m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

   Then restart sendmail again and check if the error persists.

In some cases, running one of the following commands may help fix the issue:

• make all
• m4 sendmail.mc > sendmail.cf
• cp sendmail.cf submit.cf

Let us know in the comments if you need further help with getting Sendmail up and running.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

At the end of the day, our Support Experts how to fix the Sendmail No Local Mailer Defined error.