FREE EMAIL PLANNING TOOL

Email List Splitter & SMTP Distribution Planner

Upload or paste an email list, remove duplicates, choose your SMTP account count and daily cap, then create balanced assignments with downloadable CSV files.

CSV / TXT UploadDuplicate RemovalBalanced DistributionDaily CapacityCampaign DurationCSV Export

STEP 1

Add your email list

The list stays in your browser. No email addresses are uploaded to WordPress or any external service.

Drop CSV, TSV, or TXT here or click to browse

STEP 2

Distribution settings

Choose how the cleaned list should be shared across your sending accounts.

SMTP accountsNumber of independent sending accounts. Daily limit per accountOperational daily cap for each account. Distribution methodRound robin alternates accounts; blocks keep each account's contacts together. Account name prefixExample: SMTP 1, SMTP 2, SMTP 3. Remove duplicates

Yes

Uses lowercase email matching. Skip invalid syntax

Yes

Invalid-looking addresses are not assigned.

ASSIGNABLE CONTACTS00 addresses found

SMTP accounts0

Daily capacity0/day

Campaign duration0 days

Emails found0

Duplicates0

Invalid skipped0

Largest account list0

Smallest account list0

Balance difference0

SMTP account assignments

Download each account's list as its own CSV file.

Assignment preview

Search by email address or SMTP account. Preview is capped at 2,000 matching rows for browser performance.

#	Email	SMTP Account	Account Row	Estimated Day

Daily capacity plan

How much the full setup can process each sending day.

Distribution summary

A plain-language explanation of the current split.

Important: Use sending limits that match your actual mailbox or SMTP provider rules. Splitting a list is a workload-planning tool; it does not improve sender reputation by itself and should not be used to bypass provider restrictions.