Get a boost with private warmup pools
Automated, human-like warmup flows that build trust with providers and keep your sender score healthy, before and during campaigns.
Human-like warmup
Simulated conversations (send, open, reply, move from spam) across a private network to build positive engagement signals naturally.
Controlled ramp & caps
Start low, scale steadily, and auto-pause on risk. Daily caps, per-domain limits, and schedules keep you under the radar.
Health monitoring
Protect the herd. Track sends, replies, and spam rescues. Bounce protection ensures only the healthiest addresses stay in rotation.
Every sender email gets its own schedule, caps, and safety rails. Keep new domains safe while established senders maintain steady reputation.
- Safely ramp up to avoid sending spikes and throttles
- Minimum setup required; we handle it for you
- Avoid over-sending with sensitive providers
- Maximize interactions with professional accounts only
- Free of spam traps and personal domains
Warmup in the world's most exclusive warmup network. No public sign up. No bad actors.
Auto-optimized sending limits that adapt to risk in real time — pause, cool-down, and safely ramp back up.
Manage warmup across thousands of domains all via API
Also available in the Warmup API:
/api/warmup/sender-emails
List
GET
/api/warmup/sender-emails/{senderEmailId}
Details
PATCH
/api/warmup/sender-emails/enable
Enable
PATCH
/api/warmup/sender-emails/disable
Disable
Frequently Asked Questions (FAQ)
Which settings can I control when warming up my accounts?
You only need to set your max daily warmup limit, Bison takes care of the rest. We automatically manage volume ramp-up, reply rates, and timing to mimic natural human behaviour. For some sensitive providers (eg. shared Microsoft mailboxes), we also let you control the maximum number of replies your accounts can make in a given day.
How do you gradually ramp email volume during warmup?
We start off at a low volume, and then gradually increase it everyday until we reach your max daily warmup limit. We then also add a small variance to mimic natural human behaviour.
How private is your pool?
We vet every user before signing up, and also monitor email traffic to ensure compliance. Public pools where anyone can sign up end up being dangerous for your business. Anyone can sign up, and you're sharing your reputation with bad actors.
I'm building a new product and I want to use Bison for warmup. Can I whitelabel just the warmup?
Book a call with us and let's talk. We power warmup for a lot of companies behind the scenes already.
How long should I warm up for?
This is a very nuanced question and depends on your exact use case. In general, the longer you warmup, the better your results.
Should I keep warmup always running?
Yes, if you're doing cold outreach, you must keep it running at all times.
Build a strong sender reputation
Protect your reputation before campaigns go live — and keep it healthy while you scale.