Cold Email Pacing & Mailbox Calculator
Never exceed safe email provider limits. Enter your target monthly volume to instantly calculate the ideal number of rotated sender accounts, recommended daily limits per mailbox, and optimal human jitter delay intervals.
How it works
Get started with cold email pacing calculator in a few simple steps.
Set your monthly target volume
Choose how many cold emails you plan to send this month (e.g. 10K, 20K, 50K, 100K).
Define daily send safety threshold
Select your preferred conservative cap per mailbox (recommended: 30 to 40 emails/day).
Calculate accounts & pacing
The calculator determines the exact number of mailboxes needed and the delay gaps required between emails.
Match your OutSends plan
See the most cost-effective OutSends plan (Starter for 15 accounts, Pro for 50 accounts).
Why use this free tool
Everything you need, integrated in one workspace.
- Prevents mailbox burn by keeping daily volumes safely under spam thresholds
- Calculates exact number of sending accounts required to reach your target pipeline
- Determines human delay jitter intervals (seconds) across working business hours
- Tailored plan recommendations based on 20K to 100K monthly quotas
Related tools
More free tools to power your email workflow.
Frequently asked questions
How many cold emails can I safely send from one mailbox per day?
Industry best practice is to send no more than 30 to 40 cold emails per day per mailbox. Higher volumes should always be distributed across rotated accounts.
How many accounts can I connect to OutSends?
Starter supports up to 15 connected accounts, Pro supports 50 accounts, and Growth & Team offer unlimited connected senders.
What delay should I use between outgoing emails?
A randomized delay of 30 to 75 seconds (Smart Jitter) is recommended to mimic authentic human sending behavior.
Ready to send better emails?
OutSends helps you run cold email campaigns from your own Gmail, SMTP, or API provider — free, no credit card.