SendHeaterSee your path

A modern IP warmup for a modern inbox.

Prepare outbound infrastructure with managed inbox activity, measurable sender health, and a clear signal for when your IP is ready.

See how it works

Built around the inboxes that matter

A server IP reputation card with a score visualized as flowing data points

SendHeater Made Easier.

Connect your sending IP

Add the infrastructure you want to prepare and establish a measurable starting point.

Connect your sending IP product screen
Build trusted activity product screen

Build trusted activity

SendHeater coordinates realistic inbox engagement across managed Outlook and Hotmail receivers.

Know when it is ready

Follow reputation signals and stop warming when the IP reaches a healthy, inbox-ready state.

Know when it is ready product screen

Everything your infrastructure
needs to earn trust.

Connect, authenticate, warm, monitor, and verify from one clear path.

Secure SSH connection

Connect the sending server you want to prepare through a clear, controlled setup step.

Secure SSH connection illustration

DNS authentication checks

Verify SPF, DKIM, and DMARC foundations before warmup activity begins.

DNS authentication checks illustration

IP reputation monitoring

Track sender health and surface the reputation signals that shape inbox placement.

IP reputation monitoring illustration

Microsoft-focused warmup

Build healthy sending history through deliberate Outlook and Hotmail warmup activity.

Microsoft-focused warmup illustration

Mailbox behavior simulation

Coordinate realistic receiver engagement across the managed mailbox network.

Mailbox behavior simulation illustration

Visible deliverability score

Read sending readiness through one clear score backed by observable health signals.

Visible deliverability score illustration

Event and alert detection

Catch important reputation changes early enough to protect the warmup path.

Event and alert detection illustration

SMTP error explanations

Turn delivery errors into clear context your team can understand and act on.

SMTP error explanations illustration

Readiness verification

Confirm when the sending IP has reached a healthy, inbox-ready condition.

Readiness verification illustration

Continuous monitoring

Keep sender health visible around the clock after the initial warmup is complete.

Continuous monitoring illustration

Plans

Choose a plan that’s right for you. Pause or cancel anytime.

Monthly

Billed monthly

Pause or cancel anytime

$49/month

  • Unlimited sending IPs
  • Outlook and Hotmail warmup
  • Real-time reputation monitoring
  • SPF, DKIM and DMARC checks
  • Email support
Get started
Save $30

Quarterly

Billed every 3 months

Save $30

$39/month

  • Unlimited sending IPs
  • Outlook and Hotmail warmup
  • Real-time reputation monitoring
  • SPF, DKIM and DMARC checks
  • Priority support
Get started
Save $120

Yearly

Billed annually

Save $120

$29/month

  • Unlimited sending IPs
  • Outlook and Hotmail warmup
  • Real-time reputation monitoring
  • SPF, DKIM and DMARC checks
  • Priority support
Get started

Enterprise

Custom volume, SLAs, and onboarding for larger teams.

Talk to us

Common questions

Answers before you start warming up.

Still unsure about something? These cover what most teams ask before connecting their first sending IP.

What does IP warmup actually do?

It builds up a sending IP's reputation gradually, through realistic, managed inbox activity, so mailbox providers learn to trust it before you send at full volume.

How long does a warmup take?

Most sending IPs reach a healthy, inbox-ready state within two to four weeks, depending on starting reputation and how aggressively you scale sending volume.

Which providers are supported?

SendHeater is focused on Microsoft's ecosystem today, Outlook and Hotmail, with Gmail-facing reputation signals also tracked so you can see the full picture.

Can I pause or cancel anytime?

Yes. Every plan can be paused or cancelled at any point, and warmup activity picks back up exactly where it left off when you resume.

Do you ever touch my actual email content?

No. SendHeater only coordinates authentication checks and mailbox engagement signals. It never reads, stores, or sends your real outbound email content.

What happens once my IP is ready?

You keep continuous monitoring after the initial warmup completes, so any reputation drop or delivery issue is caught early instead of after it hurts inbox placement.

Does this sound familiar?