Email frequency cap checker: find who already got your limit of emails in the last N days
In short: Upload your send log, set a cap and a window, type the next send date and get the addresses to hold back, each with the first date it can be emailed again. Limit: It counts log rows as emails sent; it does not know if they were delivered or opened.
Upload a send log with one row per email sent, holding the address and the date. Set the most emails one address may get, the number of days, and the date of your next send. The tool counts each address's sends in the days before that date, lists the ones already at the cap and gives the first date each can be emailed again.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free nowSee pricing
Sample result
A cap of 3 emails in 14 days before 2026-11-20 holds back ava@example.com until 2026-11-23; ben@ and dev@ have room.
- Hold back
- 1
- Too old to count
- 1
- Date not readable
- 1
What this means for you
A cap decides how often you write, not whether a mailbox exists; a check shows which addresses exist.
- Cap and days you choose
- Date to email again
- Optional next list
- No clock read
- Cap
- Send log
- CSV
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
Cap applied? Check the addresses you are about to send to.
- Download the file, or use the check button under the result, which carries its addresses across.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I check an email frequency cap before a send?
- Upload the send log as a CSV or .xlsx, or paste it with the header row first.
- Pick the email and date columns, then set the cap, the number of days and the date of the next send.
- Optionally paste the list you plan to send to, to split it into send and hold back.
- Download the hold-back list, or the next send with those addresses removed.
Example
- You enter
- A log of nine sends: ava@example.com on 3, 8, 12 and 18 November (the last in capitals), ben@example.org on 10 and 19 November, cara@example.net on 21 November, dev@example.com on 14/11/2026 and eli@example.com with no date, with a cap of 3 emails in 14 days and a send on 2026-11-20.
- You get
- 1 address to hold back: ava@example.com, 3 sends in the window (3 November is too old), can be emailed again from 2026-11-23. 2 have room: ben@example.org with 2 and dev@example.com with 1. 1 row is after the send date and 1 has no readable date.
- Limits
- Runs in your browser; nothing is uploaded. It counts log rows as emails sent and does not know if they were delivered.
How is the window counted?
The window is the number of days you type, ending the day before the send date. With a 14-day window and a send on 20 November, sends from 6 to 19 November count. Sends on or after the send date, and sends older than the window, are left out and counted in a note.
An address is held back when its sends in the window reach the cap, because one more email would pass it. Two log rows for the same address on the same day count as two sends.
When can a held address be emailed again?
The tool finds the send that, once it is older than the window, brings the count under the cap, and gives the first day after that. For a cap of 3 in 14 days, an address mailed on 8, 12 and 18 November can be emailed again from 23 November, because on that day the 8 November send has left the window.
No clock is read. The send date is always the one you type, so the same log and date give the same answer tomorrow.
How is this different from a cooldown filter?
A cooldown looks at one last-contacted date per lead. A cap looks at how many emails each address had across a log with many sends. For a single last-contacted date, use the recently contacted lead filter; to plan follow-ups, use the cold email follow-up planner.
Who uses this tool, and for what?
- Cold emailers
- Make sure no lead gets more than a few emails in a fortnight across several campaigns.
- Newsletter owners
- Find readers who got a launch burst of emails and rest them before the next send.
- Agencies
- Apply one frequency cap across the lists of several clients' tools.
What can’t this tool tell you?
- It counts log rows as emails sent; it does not know if they were delivered or opened.
- Its answer is only as complete as the log you upload.
- It does not decide what cap is right for your list or the law where you send.
- Only the first sheet of a workbook is read.
Common questions
- What should the send log look like?
- One row per email sent, with the address and the date it went out. Most sending tools can export that as a CSV, and you can combine several exports first.
- Does it count replies or opens?
- No. It counts rows in the log, each as one email sent. Remove rows you do not want counted before you upload.
- Why is a date not counted?
- It is older than the window, on or after the send date, blank, or unreadable. The counts of each are shown under the results.
- What if my dates are day first?
- The tool works the order out from the log when it can, and asks you to choose when a date such as 03/04/2026 could be read either way.
- Can I check my send list at the same time?
- Yes. Paste the addresses you plan to email and the tool splits them into addresses to send and addresses to hold back.
- Is my log uploaded?
- No. It is read in your browser and goes nowhere.
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.