When is warmup necessary? (New IP, new domain, poor reputation)

Situations requiring warmup:

New IP addresses:

No sending history

Unknown to providers

Must establish reputation from zero

New domains:

No domain reputation

Unknown sender identity

Need to build trust

Reputation recovery:

After blocklist removal

After reputation damage

Rebuilding from poor standing

Return from pause:

Long idle periods (months)

Returning to sending after breaks

Reputation may have decayed

Volume increases:

Significant jumps in sending volume

New audience segments

Warm into increases, not jump.

Any time you are starting fresh or rebuilding requires careful, gradual approach.