IP Warming

IP warming is a slow start for a new sending IP. You begin with small batches of email sent to people who already engage with you. This gives inbox providers time to see normal behavior. Over time you raise the volume once results look stable.

This matters because inbox providers look at your early sends to judge if you are safe or risky. If you send huge volumes from day one, filters may treat you like a spammer and block or rate limit you. A steady warm up builds a history of good delivery, opens, and clicks. That history helps more of your future email land in the inbox.

A simple way to start is to send to your most active subscribers first, such as people who opened or clicked in the last month. Watch bounce rates and spam complaints every day. If numbers look clean, increase volume in small steps instead of big jumps. If metrics worsen, hold the volume or step back until things recover.