the warmup engine for cold outreach

Give me your mailboxes. I'll make them land.

New mailboxes get flagged. Warm ones land. I write real conversations from your mailboxes, check where every email ends up, and build your reputation a little more each day. You just send when it's warm.

Your first 10 mailboxes are free. No card needed.
  • Free for 10 mailboxes
  • No fake opens
  • Real inbox checks
  • You send when it's warm

works with the mailboxes you already send from

Google Workspace
Microsoft 365
Yahoo Mail
Custom mailboxes

How it runs

Warm is earned, not faked.

Inbox providers can smell fake activity. What earns trust is real conversations, sent at a human pace, that actually get read and answered.

01 · connect

Plug in a mailbox

Connect your mailbox in about a minute. Your first ten are free, and nothing about warmup ever touches your customers or your outreach.

02 · converse

It starts real conversations

Your mailbox writes to a pool of real, established inboxes. Friendly threads, natural replies, a little more every day.

03 · correct

Measure & rescue

I check where every email lands. Anything that falls into spam gets pulled out, opened and answered. If things look risky, I slow down.

Your health score comes from real inboxes.

Not from our own dashboard patting itself on the back. We check what Gmail, Outlook and Yahoo actually think of your mail.

  • Real inbox checks. We look where your mail lands: inbox, spam, or promotions.
  • Google's own reputation data, read straight from the source.
  • Complaint reports from Microsoft and Yahoo, watched daily.
  • A hard stop long before complaints can hurt your domain.
Warm your first mailbox
Fleet health measuring
ANanna@northbeam-hq.comday 21 of ramp · 34 sends todayready
SLsales@getlumenpay.ioday 12 of ramp · 18 sends todaywarming
MVmark@vellum-labs.netday 4 of ramp · 6 sends todaywarming
checked 9 min ago · sample data92

One engine runs the whole warmup.

The conversations, the inbox checks, the reputation reports and the daily limits. All handled together, so your mailboxes heat up without getting burned.

Sends & replies in your voice

Rescues mail from spam

Watches your reputation daily

Guards your daily limits

50
sends per mailbox per day, never more
0.3%
the complaint line we never let you cross
2–6 wks
typical ramp from cold to warm

Free for your first 10 mailboxes.

No card, no trial clock. Connect up to ten mailboxes and warm them for free. You only pay when you grow past that.

Start warming free

Before you plug in your mailboxes

What does it cost?+

Nothing for your first 10 mailboxes. No card, no trial clock. You only pay when you grow past ten.

Will warmup mail show up in my CRM or campaign stats?+

Never. Warmup stays completely separate from your outreach. It can't create leads, count as a reply, or mess with your campaign numbers.

Can mailbox providers tell it's warmup?+

No. Warmup emails look exactly like normal mail, because they are normal mail. Real threads between real inboxes, with nothing hidden inside for a filter to find.

What makes the health score trustworthy?+

It's built on what providers actually see. We check real inboxes and read the reputation and complaint reports from Google, Microsoft and Yahoo. We never count our own opens or replies.

Will warmup eat into my sending limits?+

No surprises. Warmup and your campaigns share one safe daily limit per mailbox, and you always see how much of it is left for real sends.

How long until a mailbox is warm?+

Usually two to six weeks. The score decides, not the calendar. If placement dips or complaints tick up, I slow down before it costs you.

Send cold. Land warm.

Give me your mailboxes. I'll take the temperature from there.

Free for 10 mailboxes · warm in weeks · pause anytime