554 5.7.1 — Message rejected as Spat
Field: SMTPPriority: High
What does this error mean?
The recipient server considers the message or the sender as undesirable.
Probable causes
- Improper FPS/DKIM/DMARC
- IP address on blacklist
- Suspected contents or attachment
Verification and resolution
- Control SPF, DKIM and DMARC
- Check IP and domain reputation
- Reduce links and attachments
- Analyze the complete rejection message
Precaution: Do not request a blacklist removal until, having corrected the cause….
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