What to do when Microsoft throttles but Gmail is fine?

Microsoft-specific throttling response:

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.