Free tool
Cold email infrastructure calculator
Work out how many domains and inboxes you need to send the volume you want, and what they'll cost. Set a daily target and your sending limits, and the numbers update as you go.
Your sending goals
Recommended: 15 to 25 for cold outreach, to maintain deliverability.
Recommended: 2 to 3 inboxes per domain, to avoid reputation issues.
Sending days per week
Costs
Defaults: $15 a year per domain and $5 a month per Google Workspace or Microsoft 365 inbox. Change them to match your provider.
What you'll need
- Domains
- 10
- Inboxes
- 30
Sending 600 emails a day at 20 per inbox takes 30 inboxes. With 3 inboxes on each domain, that's 10 domains.
- 10 domains at $15/year
- $150/year
- 30 inboxes at $5/month
- $150/month
- Total per month
- $163
Domains are paid yearly, so the total spreads them over 12 months.
Email volume
- Per day
- 600
- Per week
- 3,000
- Per month, on average
- 12,990
- Per year
- 156,000
Mega covers 600 emails a day.
It sends up to 1,200 a day from 20 domains (60 mailboxes). We register the domains, set up the mailboxes and warm them for you. It comes with 20,000 verified lead credits a month and every Reachkit feature.
$597 a month.
More than 24,000 emails a day? Let's talk.
Tera, our largest plan, sends up to 24,000 a day from 400 domains (1,200 mailboxes). Book a call and we'll work out a setup for your volume.
Deliverability
Rules of thumb
The calculator sizes your setup. These keep it healthy once you start sending.
- Start conservative
- Begin with 15 to 20 emails per inbox per day. You can always increase once you've established good deliverability.
- Spread inboxes across domains
- Keep 2 to 3 inboxes per domain at most. The more inboxes share a domain, the more you lose if that domain gets flagged.
- Warm up first
- New inboxes need 2 to 3 weeks of warmup before sending cold emails. Factor this into your timeline.
- Mind the weekend
- B2B emails often perform worse on weekends. Consider sending 5 days a week unless you're reaching consumers.
- Quality over quantity
- A well-written email to 500 targeted prospects beats 5,000 generic emails. Get your list right first.
- Watch your bounce rate
- Keep bounce rates under 3%. High bounces hurt your domain reputation quickly.