Outside the customer network
Your inbox does not warm other InboxHot customers, and their inboxes do not warm you.
Product
Warmup without the fake customer loop.
InboxHot warms your sender with independent live recipients outside the customer network, then watches the DNS, message context, and placement signals that decide whether you can scale.
Free forever. No card required.
Why it is different
Warm the sender, not the warmup vendor's pool.
Message-aware warmup
Warmup follows your outreach language, keywords, and business context instead of generic filler.
Placement checked early
Gmail and independent IMAP seed tests show where messages land before you raise volume.
How it starts
Check one sender and keep the first moves small.
Check SPF, DKIM, and DMARC.
Bad DNS can hurt you before warmup helps. InboxHot surfaces the fix before volume increases.
Start controlled warmup.
Warmup starts low and stays sender-specific, with no customer-to-customer engagement loop.
Monitor placement before scaling.
Use the free monthly tests to see whether messages land in inbox, secondary folders, or spam.
Free start
Start with one sender before you scale outbound.
The free tier gives you safe warmup, DNS checks, and 3 placement tests each month.