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mailbox_disabled

The mailbox exists but its provider has disabled it

The server recognised the address but reported the account as disabled, suspended or deactivated. Mail to it is rejected.

appears in
reason
verdict
undeliverable
credits
Free within your email fair use: undeliverable answers that needed a mailbox probe cost nothing up to max(500, your billed email answers) in a rolling 30 days, then 1 credit each, with meta.fair_use_billed true. A billed answer repeats free for 7 days.

What it means

Unlike a mailbox that was never created, a disabled mailbox was real once: a closed account, a suspended user, a deprovisioned employee. The provider still rejects mail for it, so the verdict is undeliverable.

smtp_reason is disabled. Like mailbox_not_found, the address joins your suppression list.

What to do

Remove the address. Disabled accounts rarely come back, and when they do the owner will typically subscribe again.

Example response

{
    "email": "[email protected]",
    "deliverable": "undeliverable",
    "reason": "mailbox_disabled",
    "smtp_reason": "disabled",
    "mailbox_exists": false
}

Abbreviated: a real answer carries all 46 fields, listed in the verify-email reference.

Related

markdown version: /docs/reasons/mailbox_disabled.md