Emails sent via turbosmtp bounce on zoho emails
Hello,
We have domain emails setup with Zoho, however, we switched SMTP mailer provider (for internal reasons) to TurboSMTP.
Whenever we attempt to send an email via the Wordpress plugin WP Mail SMTP (as a CC or main recipient) the email bounces.
If we were to send an email to
avalidemail@example.com and a CC to one of our domain emails, the CC will bounce for our emails but deliver to the client. We've tried to whitelist turbosmtp's IP or the email from which we send the email, but it keeps failing. As mentioned before, it works perfectly on any other "normal" email.
Is there a way we can permanently fix this problem?