I'm using a third party mail server to send emails for the domains hosted on the VPS. They provide MX, TXT, CNAME records (without any IP address) to add in the DNS zone file for each domain, which I did successfully and emails are being sent by the PHP script using SMTP authentication.
Thus, I have disabled all email related services (Postfix, Dovecot, etc.). As a result, I'm not getting system emails like SSH login alert, IP block, etc. from CSF.
I have checked the Reporting Settings in the Firewall configuration but couldn't understand how do I perform CSF LFD to send these emails using third-party SMTP authentication for the primary domain name.
Can anyone please assist me?