What to do when Microsoft throttles but Gmail is fine?

Check SNDS:

• IP reputation status (green/yellow/red)
• Trap hit data
• Complaint rates
• Filter results

Microsoft-specific factors:

• IP-focused reputation
• SmartScreen filtering
• Complaint sensitivity

Actions:

• Reduce volume to Microsoft domains
• Clean Microsoft addresses more aggressively
• Check authentication specifically for Microsoft
• Request mitigation through SNDS/support if appropriate

Differentiation:

• Microsoft filters differently than Gmail
• Good Gmail results do not guarantee Microsoft success
• Different ports have different rules. Adjust approach for each destination.