How do automatic warm-up tools work?

Automatic warmup tools create artificial engagement by orchestrating email exchanges between participating accounts.

The mechanism:

Your account joins a pool of other warmup accounts

Tools send messages from your account to others in the pool

Recipient accounts open messages, reply, and mark as not spam

Your account performs the same actions for others

Mailbox providers see engagement signals they interpret as positive reputation

Common platforms:

Lemwarm (part of Lemlist)

Warmup Inbox

Instantly (built-in warmup)

Mailwarm

Limitations:

Engagement is artificial, not from real prospects

Mailbox providers may detect warmup patterns

Poor pool quality creates its own problems

Cannot substitute for good sending practices

Best use:

Supplement to real engagement during initial ramp-up

Maintenance sending during slow periods

Not a permanent solution for reputation problems

Warmup tools help establish initial standing but cannot maintain reputation long-term without genuine engagement.