PHP mail() function works fine but the mails are not received in mailbox

**My website URL is:www.elaeina.rf.gd

What I’m seeing is:

My site has some aspects that sends a mail to a user’s email address box. The mail() works just fine but the mail is not received in their Mailbox…

I’m using this software:

Additional information:

Also some pages on my site just recently started showing the HTTP ERROR 500 including my Index.php page

For the PHP mail function:

For the HTTP ERROR 500:

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