What’s “disabled mailbox”?
A disabled mailbox is intentionally deactivated:
What it means:
Account exists but is not accepting mail. Administrator or provider disabled it. Different from non-existent user.
Common reasons:
Employee departure: Corporate account disabled. Account suspension: Policy violation or abuse. Non-payment: Subscription or service lapse. Security: Account compromised and locked.
Typical codes:
550 or 553 with "mailbox disabled" or "account disabled." 5.2.1 (mailbox disabled, not accepting messages). 5.1.1 may also be used.
Handling:
Treat as hard bounce. Suppress the address. Account reactivation is possible but unpredictable.
Disabled mailbox is a closed shop. The address exists but is not open for business.
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