FREE TOOL
Calculate exactly how many mailboxes you need for cold email campaigns. Find the most cost-effective plan based on your volume and timeline.
CONFIGURE YOUR CAMPAIGN
Recommended Settings
CALCULATION RESULTS
667
Daily Volume
500
Expected Replies
30 mailboxes included + 15 add-on mailboxes
Pricing Breakdown:
Base Plan: $81/mo
+ 15 add-ons × $2.7 = $40.50
Analyze domain health and DNS configuration.
Test email content for spam triggers and filters.
Analyze email headers for authentication issues.
Comprehensive domain analysis for all email records.
Best practices for managing multiple campaigns.
A cold email mailbox calculator determines exactly how many email addresses you need to execute your outreach campaign while maintaining high deliverability and avoiding spam filters. It balances volume needs with safety limits.
Volume distribution
Spreading emails across addresses keeps each under spam detection thresholds.
Risk mitigation
If one mailbox has issues, others remain unaffected and operational.
Scalability
More mailboxes enable higher volume while maintaining deliverability.
Warmup period
New mailboxes need 14-30 days of gradual volume increase.
Daily limits
Stay under 15-20 emails per mailbox per day for safety.
Domain diversity
Use multiple domains to further distribute sending reputation.
The number of mailboxes depends on your total sending volume and daily limits. We recommend sending no more than 30-50 emails per mailbox per day to maintain good deliverability.
Using multiple mailboxes helps distribute your sending volume, reducing the risk of hitting spam filters or getting blocked by email providers. It also allows you to scale your outreach safely.
Email warmup is the process of gradually increasing the sending volume of a new mailbox to build a positive reputation with email service providers. This helps ensure your emails land in the inbox.
The cost varies depending on the plan you choose. Our calculator helps you estimate the total cost based on your specific needs and volume requirements.
Get the exact number of mailboxes you need with guaranteed deliverability
