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Free ToolsCold Email Setup Calculator

Cold Email Setup Calculator

Find out exactly how much infrastructure your sending volume needs — mailboxes, sending domains and accounts — so you scale safely instead of burning your domain.

Infrastructure Planning

Cold Email Setup Calculator

Tell us your target volume and we'll size the infrastructure — mailboxes, sending domains and accounts — so you scale safely instead of burning your domain.

30

Keep new mailboxes conservative (20–50/day) to protect sender reputation.

3

Spreading mailboxes across domains isolates risk if one gets flagged.

100
Mailboxes needed
to send safely
34
Sending domains
100
Emails / day

That's a lot to set up by hand. MailOptimal sells pre-warmed Google, Microsoft and Azure mailboxes in bulk — domains, DNS and authentication included — so you stand up this exact setup in minutes.

Get pre-warmed mailboxes
How it works

Size your sending infrastructure in three steps

1

Set your target volume

Tell us how many cold emails you want to send per day or per month.

2

Tune the safety limits

Adjust the per-mailbox daily cap and mailboxes-per-domain to match your risk tolerance.

3

Get your setup

See exactly how many mailboxes and domains you need — and the realistic ramp to get there.

Keep going

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FAQ

Common questions

How many emails can one mailbox send per day?
Most teams keep new mailboxes to 20–50 cold emails/day to protect reputation. We default to a conservative cap you can adjust to your appetite for risk.
Why spread sending across multiple domains?
Concentrating volume on one domain puts your whole operation at risk if it gets flagged. Spreading across domains and mailboxes isolates risk and protects deliverability.
Do I need to warm up new mailboxes?
Yes — new mailboxes should warm up for 2–3 weeks before sending cold volume, ramping gradually. Warmup builds the sending reputation that lands you in the inbox.
Can I really buy this many mailboxes?
Yes. Outboundry sells pre-warmed Google, Microsoft and Azure mailboxes in bulk, with domains and authentication included — so you can stand up the setup this calculator recommends in minutes.
From plan to inbox

Buy the exact setup you just sized

Outboundry sells pre-warmed mailboxes and sending domains in bulk — fully authenticated and ready to send. Stand up the infrastructure this calculator recommends without the manual setup.

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