The step-by-step instructions to set up Linux Sendmail configuration SMTP Server are given below. If you do not have your own SMTP relay, you can use your ISP SMTP relay. To use the ISP SMTP relay or your enterprise SMTP relay, you need to provide credentials. This is necessary when you want to send email messages to the external recipients. It will help avoid spoofs and also enable anti-spam filters to get the email messages that are not coming from your whitelist SMTP relay. By default, it might use a local SMTP mechanism. Mostly, this mechanism will be blocked by SMTP systems.
Step 1 - Editing SendMail make file
Step 2 - Removing comment
Step 3 - Replacing ‘smtp.your.provider’
Step 4 - Regenerating SendMail configuration file
Step 1 - Mail configuration directory
Step 2 - Creating hash map and Authinfo
Step 3 - Regenerating SendMail configuration file
Restarting the service
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