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.
That's a lot to set up by hand. Outboundry 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 mailboxesSize your sending infrastructure in three steps
Set your target volume
Tell us how many cold emails you want to send per day or per month.
Tune the safety limits
Adjust the per-mailbox daily cap and mailboxes-per-domain to match your risk tolerance.
Get your setup
See exactly how many mailboxes and domains you need — and the realistic ramp to get there.
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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.
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.
Join 1,000+ teams running smarter outbound on Outboundry.