wp_mail only sends emails to gmail

Welcome to WPD stack exchange.

as I am see its look like sometimes we have forgot to add some basic need and function not working properly.

Please try with header parameter:

$headers[] = 'Content-type: text/plain; charset=utf-8';  
$headers[] = 'From:' . "[email protected]";

Also, you can use Easy WP SMTP and enable debugging and/or set that up to use SMTP. If something like GMail works then you’ll know it is a server setting and not this code.

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