550 5.7.1
550 5.7.1 Message Flagged as Spam
Gmail believes the content or consent for this campaign is not valid.
If a message resembles spam or recipients repeatedly mark it as junk, Gmail issues 5.7.1 and blocks future attempts with the same payload.
Severity
ERROR
Provider
Gmail
Reference
Mitigation Portal
Last Reviewed
2025-06-01
How to Fix 550 5.7.1
Follow these steps to resolve this Gmail SMTP error and restore normal delivery.
- ✓Review copy, subject lines, and link strategy for spam traits.
- ✓Remove purchased, rented, or scraped lists permanently.
- ✓Place unengaged Gmail recipients into reactivation journeys before sending full campaigns.
- ✓Add prominent, one-click unsubscribe tools to reduce complaint pressure.
Helpful Resources
More Gmail SMTP Codes
Keep these related troubleshooting guides handy while addressing 550 5.7.1.
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