550 5.2.1
550 5.2.1 Mailbox Disabled
The destination mailbox exists but is disabled or suspended.
Google Workspace admins can suspend accounts or place them on hold. Gmail responds with 5.2.1. The address may be reactivated later.
Severity
WARNING
Provider
Gmail
Reference
Mitigation Portal
Last Reviewed
2025-06-01
How to Fix 550 5.2.1
Follow these steps to resolve this Gmail SMTP error and restore normal delivery.
- ✓Treat the event as a soft bounce and retry in your normal cadence.
- ✓Escalate to the account owner if the contact is business critical.
- ✓Suppress the address after repeated failures over several campaigns.
- ✓Log the event for customer success follow-up.
Helpful Resources
More Gmail SMTP Codes
Keep these related troubleshooting guides handy while addressing 550 5.2.1.
Still experiencing Gmail delivery issues?
Run your domain through our free deliverability tools or book a session with Bento's deliverability specialists.