Lead source quality report: compare vendors and lists in one file
In short: Upload one list with a source column and see, for each source, how many rows have no address, repeat an earlier address, are role addresses or are webmail, and how many are usable. Limit: It reads the shape of the data only; it cannot tell which mailboxes work.
Upload one list with a column that says where each lead came from, such as a vendor or list name. For each source you get the rows, those with no address, repeats of an earlier address, role addresses such as info@, webmail addresses and the usable rows left. It reads the shape of the data and does not check mailboxes.
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
Eight example rows from three sources have 5 usable. Vendor B has the most trouble: one repeat, one blank and one Gmail address.
- Usable rows
- 5 of 8
- Repeats
- 1
- No address
- 1
What this means for you
This reads the shape of the data; a mailbox check shows which addresses really exist.
- One row per source
- Repeats, role, webmail
- Usable share
- Report to download
- Lead sources
- Report
- CSV
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
Want to know which source has real mailboxes?
- Download the report here, or use the check button under the result, which carries the 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 compare lead sources in one list?
- Put the leads from every source in one file, with a column that names the source.
- Upload the file as a CSV or .xlsx, or paste it with the header row first.
- Choose the source column if it was not found by name.
- Read the table, then download the report.
Example
- You enter
- Eight rows from three sources (Vendor A, Vendor B, Webinar): one repeated address, one info@ address, one Gmail address and one row with no email.
- You get
- 8 rows, 5 usable. Vendor A has 3 rows and 2 usable (one role address). Vendor B has 4 rows and 2 usable (one repeat, one blank, one Gmail address). Webinar has 1 row and 1 usable.
- Limits
- Runs in your browser with no row cap; an uploaded file can be up to 25 MB. Nothing is uploaded.
What does each column mean?
No address counts rows whose email cell is blank or not address-shaped. Repeats counts rows whose address already appeared on an earlier row, on the same source or another. Role counts addresses such as info@ and sales@, which reach a shared inbox. Webmail counts Gmail, Outlook.com, Yahoo and similar personal or internet provider mailboxes.
Usable is a row with an address that is the first time it appears and is not a role address. A repeat is counted against the later row, so the source that came second in the file takes the repeat. Put your lists in the order you received them.
What this report can and cannot say
It shows how clean each source looks on the page: blanks, overlap, shared inboxes and personal mail on a business list. A source with many repeats may simply be reselling the same data as another one.
It cannot say how many addresses on a source will bounce. Only a live mailbox check shows that, so run the file through the bulk email verification and compare the valid share per source.
Using it before you buy more
Ask each vendor for a small sample, add a source column and load them together. The report shows which sample overlaps with what you already own, which is part of what you pay for, before you commit to a large order.
To compare vendors by price per usable lead, the lead list vendor comparison calculator takes these counts as input.
Who uses this tool, and for what?
- Cold emailers
- Compare samples from several list vendors before ordering a large list.
- Agencies
- Show a client which of their lead sources is mostly repeats or shared inboxes.
- Sales teams
- See which campaigns or events brought in webmail addresses on a business list.
What can’t this tool tell you?
- It reads the shape of the data only; it cannot tell which mailboxes work.
- A repeat is attributed to the later row, so the order of the file affects the table.
- Role and webmail lists are our own; an unusual provider may be counted as a company address.
- Only the first sheet of a workbook is read.
Common questions
- Does it check whether the emails work?
- No. It reads the shape of the data only. A mailbox check shows which addresses exist.
- How is a repeat counted?
- Against the later row, so put your lists in the order you received them. Addresses are compared without regard to case.
- What if some rows have no source?
- They are grouped under (no source) so you can see them.
- Can I compare more than two sources?
- Yes. Any number of values in the source column gets its own row in the table.
- What counts as webmail?
- Addresses on the free mailbox and internet provider domains in our list of free email providers, such as gmail.com and outlook.com.
- Is my list uploaded?
- No. The report is built in your browser and nothing is sent anywhere unless you choose to check the addresses afterwards.
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.