Sendmail smart host smtp relay service

If you are using Sendmail as your email server you can improve your deliverability by configuring a Turbo SMTP Smart host relay service. You’ll be recognized as a reliable email sender and protect yourself against identity theft. Here is the path you have to follow to set up our smart host smtp relay service in Sendmail:

For EU customers: please replace with

First, set your access credentials /etc/mail/access "U:yourUserName" "P:yourPassword" "M:PLAIN"

In /etc/mail/, after the first line (#dnl define(‘SMART_HOST’, ‘smtp.your.provider’)dnl), set your Smart Host definition:

define(`SMART_HOST', `')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 587')dnl

To complete the procedure, update and access.db files. Note: you will have to execute these commands as ‘su’ or ‘root’

$ cd /etc/mail
$ m4 >
$ makemap hash access < access

Finally restart Sendmail following the path that matches your Sendmail version:

For older versions:

$ /etc/init.d/sendmail restart

For newer versions:

$ service sendmail restart

If you want to see the effects of a smart host smtp relay service try our turboSMTP

Every company needs a smart host relay service both for external and internal communication. A smart host relay guarantees better deliverability and reputation, protects your domain (no one can pretend to be you or a member of your company) and lets you to track your emails and your users' actions.

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Learn more about our Smart Host Relay Service