Create SMTP user in PowerMTA

Once you have PowerMTA installed, you need to create SMTP user. To create an SMTP user, edit file

vi /etc/pmta/config

Find

#
#    password "changeme"
#

Add below

    password "SMTP_PASSWORD_HERE"
    source {smtpuser-auth}



    smtp-service yes
    always-allow-relaying yes
    require-auth true
    process-x-virtual-mta yes
    default-virtual-mta vmta-1
    remove-received-headers true
    #add-received-headers false
    hide-message-source true



    #smtp-source-host 79.137.44.176 smtp1.serverok.in
    #domain-key default,smtp1.serverok.in,/etc/pmta/default.smtp1.serverok.in.pem
    
    max-msg-rate 100/h
    

In above code, replace SMTP_USERNAME_HERE and SMTP_PASSWORD_HERE with SMTP username and password you need.

in vmta-1, domain-key line that is commented out is used to Enable DKIM signing of out going emails.

Resatrt PowerMTA

systemctl restart pmta