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

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.