Light the furnace. Land in the inbox.
Mail Furnace helps teams warm domains, monitor reputation, and troubleshoot deliverability - so campaigns ship reliably and replies show up where they should.
Structured warm-up plans that build reputation safely over time.
Track deliverability signals and catch issues before they tank placement.
See why a message is landing in spam and what to change (fast).
See how Mail Furnace improves your inbox placement.
Mail Furnace ramps sending volume on a schedule tuned to each provider's tolerance. You set the target - we handle pacing, rotation, and engagement signals so your domain builds trust before the first real campaign goes out.
Volume ramps adapt to Gmail, Outlook, and Yahoo thresholds automatically.
Real opens, clicks, and replies from a seed network - not bots.
Warm multiple domains in parallel without cross-contamination.
Pause, accelerate, or extend any warm-up with one click.
See deliverability signals, detect sudden drops, and get a clear checklist of what to change - copy, authentication, cadence, or list hygiene.
Real people, real engagement, real results. 3 month commitment on all plans.
Get started with domain warming and inbox placement.
For teams scaling outreach and protecting sender reputation.
For high-volume senders who need maximum deliverability.
Need more emails or contacts? Contact us for a custom enterprise account.
If Mail Furnace doesn't measurably improve your inbox placement within 30 days, our deliverability team works with you hands-on until it does. No extra charge.
"We were stuck at 60% inbox placement for months. Mail Furnace identified three authentication gaps and a content pattern that was triggering filters. Within two weeks we were consistently above 90%."
"Every time we scaled outreach, we'd end up on a blacklist. The warm-up engine and monitoring alerts caught problems before they spread. Haven't hit a blacklist in six months."
"Our cold outreach reply rate tripled after fixing the deliverability issues Mail Furnace surfaced. Turns out half our emails were landing in spam and we had no idea."
"We used to manually check placement across Gmail, Outlook, and Yahoo every morning. Now the dashboard shows everything and alerts us only when something actually needs attention."
"We were stuck at 60% inbox placement for months. Mail Furnace identified three authentication gaps and a content pattern that was triggering filters. Within two weeks we were consistently above 90%."
"Every time we scaled outreach, we'd end up on a blacklist. The warm-up engine and monitoring alerts caught problems before they spread. Haven't hit a blacklist in six months."
"Our cold outreach reply rate tripled after fixing the deliverability issues Mail Furnace surfaced. Turns out half our emails were landing in spam and we had no idea."
"We used to manually check placement across Gmail, Outlook, and Yahoo every morning. Now the dashboard shows everything and alerts us only when something actually needs attention."
Tell us about your sending setup and we'll show you exactly where your deliverability stands - and how to fix it.