"Send a test email" Not working

[ZeChevalier]

Using Prestashop 8.1.6.

When I click "Send a test email" under Design > Email Theme, and try to send a test email it shows "Test email for layout test was successfully sent to example@example.com" but the email is not in my inbox or in the spam folder.

Sending automated emails when making sales etc works fine, but I need to send tests to make some changes and make sure they work.

[Prestashop Addict]

Which domain are you using for test? May be a DKIM, SPF, DMARC issue.

[ZeChevalier]

How do I check/modify which domain the test uses? I only assumed it uses the same domain that sends when I make a test order through the website front end.

Edit: In the Advanced Paremeters > E-mail settings I have "Use /usr/sbin/sendmail (recommended; works in most cases)" checked.

Edited February 13 by ZeChevalier (see edit history)

[ZeChevalier]

Sorry, the website won't let me edit my post without approval, but In the Advanced Paremeters > E-mail settings I have "Use /usr/sbin/sendmail (recommended; works in most cases)" checked. Do I need to set custom settings there?

[Prestashop Addict]

ok misunderstood, I asked about the domain of the email you use to test (ex: @gmail.com). Does it the same email you use for transactional?

[ZeChevalier]

Yes, I used a Gmail.com email for the test. The email sends from my website domain.

The issue is actually deeper than I thought however, I just realized that my newletter verification emails also do not send, instead they get the error smtp 550 "message rejected", but if I manually confirm these newsletter requests the confirmation email sends fine, which leads me to believe there's a problem with the verification link.

Could Hostgator be marking my verification emails as a potential security threat?