I had added a dkim txt record in my domain, it works fine.
I had added the signature in my email using phpMaier library but when the email goes to Gmail and I inspected that dkim verification failed. Can you help with that? Also, I didn't explicitly set up any SPF and dmarc records.
// sign
$mail->DKIM_domain = 'redravian.com';
$mail->DKIM_private = __DIR__.'/key.private';
$mail->DKIM_selector = '1636290028.redravian';
$mail->DKIM_passphrase = ''; //key is not encrypted