You can use Let's Encrypt if supported or buy a cheep SSL at ssls.com
]]>I found a solution to the problem. By default, the mail function requires SSL certificates. Unfortunately, I didn't add SSL certificates on my server. So, changing the mail function to ignore the certificates solved the problem.
Thank you so much.
]]>You tried Gmail with the Gmail password or the specific app password?
]]>Regarding the fact of your personal domain email that doesn't work can be an issue of the email certificate if you are sure all options and credentials are correct.
If you have a WordPress install you may try to configure the same personal domain email address with the plugin Easy WP SMTP; I'm pretty sure that the problem you are having is not related to LHC.
I configured email settings but I received error SMTP connect() failed. https//github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
I tried all possible ways suggested on the internet and in the LHC forum with no success.
I tried
tls://smtp.myhost.com
smtp.myhost.com
ports:587 465 25
NOTE: The system is hosted in the server which has another system inside it, and the other system sends mail using the same credentials without any problem.
Please help. Thanks