Issues with email sending after changing Hosting

I'm receiving lots of messages (email errors) of this type:

Code:

"Email to mail@domain.com from info@website.com failed: Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients ""
I also tried the test email via the control panel and that too doesn't send, it even generates a bounced sender code like this:
Code:

++ XF\Mail\SmtpTransport started
>> MAIL FROM:<bounced+6d8071b9+username=gmail.com@website.com>....

I changed 2 hosts and both had the...

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