Free outreach tools

Calculators and checks for email warmup, cold-email capacity, and email verification. No account required for the calculators. WarmySender runs outreach on autopilot with AI agents across cold email, email warmup, LinkedIn, Instagram and multichannel sequences. These pages answer the arithmetic before you send anything.

• Email warmup schedule calculator — How many sending days a set of mailboxes needs to reach a target daily warmup volume, using the same ramp WarmySender applies. Only days a mailbox actually sends count.
• Cold email sending capacity calculator — How many mailboxes and sending domains you need for a daily cold-email volume, inside the per-mailbox default and the domain ceiling (warmup included).
• Email verifier — Check whether an address can receive mail before you send. The verifier page shows what you can check today without a plan.
• LinkedIn browser extension — Run LinkedIn-only outreach from your own browser inside the same safe daily limits as every other account.

Research

• Email deliverability benchmarks
• Best email warmup tools
• Best cold email tools

Common questions

Do these tools need an account?

The warmup schedule calculator and the cold-email sending capacity calculator run in the browser with no account. The email verifier page shows what you can check today without a plan.

Where do the numbers come from?

The warmup curve is the same schedule WarmySender uses for a mailbox. The domain ceilings are 200, 2,000, 10,000 emails a day. Cold email is planned at 50 a day per mailbox, which is the default daily limit.