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I recently added a new domain to my mail server. I have 1 main server mail.example.com and several others that have the mx record pointing to mail.example.com. My two new domains have the mx record set correctly.

The issue I am experiencing is the 550 Requested action not taken: mailbox unavailable error but only when I send emails to accounts on the new urls from an external email account such as gmail. If i send an email to one of the newly made email addresses with the new url from an email account within the same server it delivers normally.

For example....
sending blahblah@gmail.com to newemail@example.com receives 550 error
sending newemail@example.com to newemail2@example.com works normal

here is a report from wormly.com with server and account names changed for obvious reasons

Resolving hostname...
Connecting...
SMTP -> FROM SERVER:
220 existingmailserver.com ESMTP Service ready
SMTP -> FROM SERVER: 
250-Requested mail action okay, completed
250-SIZE 0
250-AUTH LOGIN PLAIN CRAM-MD5
250-ETRN
250-8BITMIME
250 OK
MAIL FROM: example@gmail.com
SMTP -> FROM SERVER:
250 Requested mail action okay, completed
RCPT TO: newaccount@NEWURL.com
SMTP -> FROM SERVER:
550 Requested action not taken: mailbox unavailable
SMTP -> ERROR: RCPT not accepted from server: 550 Requested action not taken: mailbox unavailable

Message sending failed.
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