How Email Warmup Works
WarmySender's email warmup system automatically builds your sender reputation by exchanging emails between real mailboxes in our network. Here is how it works:
Sending: Your mailbox sends warmup emails to other WarmySender users' mailboxes according to your daily volume settings. The system starts with low volume and gradually increases over time.
Receiving: Other WarmySender users' mailboxes send emails to yours. Your mailbox automatically opens, marks as important, and replies to these emails — signaling to email providers (Gmail, Outlook, Yahoo) that your messages are wanted.
Spam Rescue: If any warmup emails land in your spam/junk folder, WarmySender automatically detects them and moves them back to your inbox. This 'rescues' your reputation by training email providers that your messages belong in the inbox.
Peer Selection: The system intelligently pairs your mailbox with other healthy mailboxes. It prefers cross-provider pairing (e.g., Gmail sends to Outlook) for better deliverability signals. Unhealthy mailboxes with high spam or bounce rates are excluded from the peer pool.
Health Scoring: Your mailbox gets a Health Score (0-100) calculated from inbox placement rate, spam rate, and bounce rate over a 7-day rolling window. Score above 80 = Excellent, 60-79 = Good, 40-59 = Fair, below 40 = Critical.
The warmup process runs 24/7 within your configured time window. Most mailboxes reach a healthy score within 2-3 weeks.