550 5.1.6 Destination mailbox has moved, No forwarding address

Meaning

The mailbox address was valid, but mail is no longer accepted.

Common causes

• User left company.
• Account deleted.

How to fix

1. Remove from list.

Example bounce

550 5.1.6 Destination mailbox has moved

Related codes

• 550 5.1.1 User unknown / invalid address
• 550 5.1.2 Bad destination system address
• 550 5.1.10 Recipient not found