Email sending volume is a critical performance metric in cold outreach platforms. However, the maximum number of emails that can be sent daily does not always equal the number that gets sent. To protect your sender reputation and ensure high inbox placement, multiple layers of filtering and scheduling are applied behind the scenes.
This guide explains how email sending volume is calculated, managed, and optimized.
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Sending Limits
Each connected mailbox has a defined maximum daily send limit. However, that doesn’t guarantee the system will use the full limit. The platform applies smart rules to avoid oversending and preserve your domain reputation.
Example: If your mailbox can send 30 emails/day and you have 10 mailboxes, the theoretical max is 300 emails/day. However, actual volume might be lower based on list quality, schedule, and validation.
For more information on adjusting the email sending limits, refer to the Email Limit & Ramp-Up Schedule document.
Lead Filtering Process
Before any contact is added to the sending queue, the system applies several checks to ensure only high-quality, safe-to-send leads go out.
Steps | Description |
Email Format Check | Verifies if the email looks valid (e.g., correct @domain.com format). To check |
Email Verification | Confirms the email can technically receive messages. To verify |
Email Validation | Categorizes emails as deliverable, risky, unknown, etc. To validate |
Block/Unsubscribe List | Removes anyone who previously unsubscribed or is blocked. To block |
Duplicates across Campaigns | Prevents sending to the same contact in multiple campaigns (unless toggled on). To duplicate |
Tip: Use only deliverable contacts to get the highest possible daily send volume.
Queue & Scheduling
Every campaign has a Queue tab, which shows scheduled sends across upcoming days. This allows you to see how emails are staggered.
Emails are scheduled based on lead availability and mailbox limits.
If leads are invalid, missing, or duplicates, they will not enter the queue.
The queue auto-distributes valid leads across mailboxes fairly.
Example: If you have 3 mailboxes with 15 emails/day limits = 45 emails/day total. But if only 30 clean leads are available, the system assigns roughly 10 per mailbox.
Ramp-Up Strategy
Ramping up your sending volume gradually is essential to building trust with email providers and maintaining healthy sender scores.
The platform uses a default ramp-up schedule that increases safely, either daily or weekly.
You can customize the ramp-up speed, but avoid aggressive increases like +5 or +10 emails per day.
Fast volume spikes can trigger spam filters and damage reputation.
Recommendation: Stick to the default ramp-up speed or go slower if needed. Let mailbox reputation grow naturally for maximum inbox placement. For more