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So I was having this problem we’re all having of not being able to connect to the SMTP server.
In my case I had to send through SMTP without any encryption. I noticed that even when I checked the “no encryption” option on the plugin it would try to connect using an encryption method.
So I went to wp-includes/class-phpmailer.php and changed $SMTPAutoTLS from true to false, meaning it won’t try to use TLS encryption automatically anymore.
It connected and it worked.