ProtonMail Settings

I have my WordPress website hosted on HostGator. Per HostGator, they have strict security and prohibit the use of the WP Mailer on it’s own and suggested I use this plugin to get my WPForms contact form to send. So, I downloaded the plugin, installed it, and activated it. I then went to enter the settings for my mail service. I use the paid ProtonMail service. I entered the following information into WP Mail SMTP:

From Email: My @domain email address, which is my domain for my paid ProtonMail account.
From Name: My Name
Return Path Not checked.
Mailer: Other is checked.

Under Other SMTP I have the following settings:

SMTP Host: SECURE.EMAILSRVR.COM
Encryption: SSL (I have also tried TLS instead of SSL)
SMTP Port: 465
Auto TLS: Yes
Authentication: On
SMTP Usernamt: My protonmail email address (@protonmail.com address)
SMTP Password: I have that set in the wp-config.php file

When I go to send a test email under the Test Email tab of WP Mail SMTP plugin, I get an error. Suggestions are very generic. Just tells me to check my SMTP settings, contact mail provider, or host. That literally tells me nothing about the error. That’s basically telling me to check literally everything possible. Unfortunately, the Email Logs is Pro only. Would be nice to offer at least basic logs under the Lite version of the plugin. After all, why would I pay for a plugin I can’t even get working? A working plugin convinces me to purchase the Pro version.