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Why the number of sent emails doesn't match your contact list

When checking your campaign statistics, you might notice that the Number of Sent Emails is less than the total Number of Contacts in your list. This is not an error—it is a critical feature designed to protect your sender reputation and maximize deliverability.

Pre-Send Email Validation

Before Sendigram EMS sends a single email, it automatically runs an intensive validation check on every address in your list. This process confirms the health and status of each email address, checking for issues such as:

Invalid Syntax: Incorrect formatting (e.g., missing "@" symbol).
Non-Existent Domains/Mailboxes: The domain or the specific user mailbox doesn't exist.
High-Risk Addresses: Known spam traps, disposable email addresses, or severely misconfigured servers.

If an email address fails this validation, it is immediately categorized as Undeliverable or Risky.

Category	Action Taken	Reason for Filtering
Undeliverable	DO NOT SEND	Mailbox is confirmed non-existent, the domain is invalid, or the address has a critical error.
Risky	DO NOT SEND	Address is temporary, or a potential spam trap. Sending would be highly detrimental.

By automatically excluding these unhealthy addresses, Sendigram ensures that your emails are only sent to verified, deliverable addresses.

The goal of this validation is simple: to prevent damage to your sending domain and IP address.

Sending emails to invalid or high-risk addresses results in high bounce rates and spam complaints. High metrics in either category cause your domain and IP address to be flagged by major ISPs (like Gmail, Outlook, etc.), which can quickly lead to:

Reduced Deliverability: Even your good emails start going to the spam folder.
Blacklisting: Your domain/IP is completely blocked.

The final Sent Emails count you see in your statistics represents the actual number of emails delivered to the inbox provider's servers — a clean, optimized list — and is the key to maintaining a strong sender reputation over time.

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