Done-for-you pre-send checking
Free check on your list
How it works

What happens to your file in a full check

You send the list you are about to work. We run the checks automatically, row by row, a person approves the finished check, and it comes back. That is a full check. Every row ends Ready, Stopped or Protected. You are not asked to operate anything and there is nothing to set up.

one row, as you sent it
L. Carrow 3 Account Director, Ashdon Field Ltd 1 l.carrow@•••••.co.uk 2 (empty)
1 · the address The address accepted mail when it was checked.
2 · the number No number in the row.
3 · the profile Profile present. It lists a current role.
4 · the duplicates A row we stop as a duplicate of another row in your file goes to the stopped rows, with its reason.
An example row. The person, organisation and address are invented.
You give

The list you were handed

A CRM export in your own columns. A full check takes the whole file, up to 5,000 rows; the free check takes up to 300 rows you choose. Nobody has checked which email addresses still accept mail, which mobile numbers are still live, or who has moved on since it was built.

We do

One full check across the whole file

Whether each email address accepts mail, whether each mobile number is live, whether the person is still in the role and organisation on your row, and which rows are the same contact twice. The checking your team would have to do by hand.

We check whether a number is live. We do not screen numbers against the Telephone Preference Service (TPS) or the Corporate Telephone Preference Service (CTPS): whether a number may be called for marketing is not something this full check establishes.

You get

Seven files and one link

The working file in the shape it arrived, and behind it the evidence for every row we acted on, each with the date we checked it. Row by row, a Row Passport records what was checked and what came back.

You can show

Why each row is where it is

The list you did not build goes out as yours, and every row in it has a reason and a date behind it.

00

What we never do

  • We never reach into your systems and change anything, unless you ask us to write back, and then only into fields we add.
  • We never merge records in your CRM or your own systems.
  • We never tell you who to contact first.
  • We never put a claim in your file we cannot back.
  • We never sell the data you send us, and we do not sell replacements for the rows we stop, so we have nothing riding on how your list looks.

We show what the evidence supports. You decide. Disagreements are shown, not guessed.

your side Your CRM and your systems
our side Datuma Works on the list you send.
You send the list
Seven files and one link come back
01

The list, in the shape it arrived

Your headers survive in your order. Your own columns are passed through untouched. Empty cells stay empty where nothing was found. Nobody at your end has to put the file back together.

Behind it +

your file is read as a file, column by column, and mapped once. That mapping becomes part of your baseline, so the next list you send is read the same way.

02

What we found, and when

For each contact we could check, we tell you what we found for each way of reaching them, and the date we checked it. An address that accepts mail, an address that does not, a professional profile we could find or could not. Where we can read it, the person's own headline and how long they appear to have been in the role.

Behind it +

the mailbox check is a live check against the receiving mail server, not a guess from a pattern. The role check reads what the person publishes about themselves and quotes it back to you as the evidence.

What it is not: a ranking, a grade or a score in the files. There is no column telling you who to contact first. The evidence and the date are the display, and the judgement stays yours.

03

Duplicates in your file

A row we stop as a duplicate of another row in your file goes into the stopped rows with its reason, and the contact is listed once, on the other row. Nothing is merged in your CRM or your own systems.

04

The stopped rows

Every row we stopped sits in a second file with one line of reasoning against it and the date we checked it. It is the part of the full check you can compare against your own knowledge of your own data, one row at a time. If you disagree with a stopped row, put it back.

05

The Decision Brief

Some rows raise a question before your full check comes back.

  • A mail server set up to accept every address put to it, real or not, so nothing we send it can tell us whether this particular mailbox exists. We withhold the address. The row stays in your working file only where another way to reach the person was established.
  • A role or organisation that does not match your row, so a person reviews it. Where the review confirms a move away from the organisation on your row, the row is in your stopped rows. Where it does not establish one, the row stays in your working file with what we found beside it.
  • A record we found that we could not establish belongs to the person in your row. We do not use anything we found about this person.

The Decision Brief records the rows placed by a person's review of a possible change of role or organisation, what we decided on each and the evidence for it. Each one shows what arrived, what we found, what we decided and where the row is now. Rows decided by a fixed rule, such as an address at a catch-all domain, are not in it: the rule is on each row in the update file.

Nothing here needs an answer: your files already reflect every decision. If you disagree with a decision on a row in your stopped rows, you can put that row back in your own list.

06

The changelog

Every change and every removal is recorded with the reason and the date, in the changelog delivered with your files.

07

Before the file moves

Before we touch a file we agree the terms and take one short written instruction from you: who you are instructing us on behalf of, that you are authorised to do so, what is in the file, what you are asking us to do, and anything in it we must never touch. On the call we agree the other two: where the finished list is going, and how you want the evidence. How we handle data is on our security page.

What comes backseven files and one link

The work comes back finished, with the evidence attached

…_working_v01.csv FILE 1 OF 7

The list, in the shape it arrived

Your columns, in your column order, carrying the rows that nothing stopped.

YOUR HEADER ROW, AS YOU SENT IT
CRM IDFirst NameLast NameJob TitleCompany NameWork Emailand the rest of yours
ONE ROW IN YOUR WORKING FILE
Colin Calloway · Managing Director · Dovecote Holt Associates Ltd · c.calloway@•••••.co.uk

2,075 of 2,400 rows in your working file.

…_decision-brief_v01.html FILE 4 OF 7

The Decision Brief

The rows placed by a person's review of a possible change of role or organisation, with what we decided on each and why.

Role or organisation change 58
WHAT WE DECIDED
The review established a move away from the organisation on your row.

Nothing here needs an answer: your files already reflect every decision.

58 rows: 30 in your working file, 28 in your stopped rows.

role or organisation change 58
…_row-passport_v01.html FILE 7 OF 7

The Row Passports

One card per row: the finding it carries, the evidence behind it, and the date we checked.

The other four files: what was checked, what came out, what changed, and the list for your sending tool
…_datuma-update_v01.csv FILE 2 OF 7

The update file

One row for every row you sent: the outcome, the reason, the dates and what each channel established, keyed on your own record ID.

AS IT ARRIVED
CW-105324, Margaret Calloway, Project Manager, Bretton Leigh Analytics Ltd, margaret.calloway@•••••.co.uk
DATUMA OUTCOME
READY. Nothing we found required this row to be stopped.
EACH CHANNEL
Email ACCEPTS_MAIL · Phone LINE_LIVE · Profile SUPPLIED_PROFILE
DATUMA CHECKED ON
2026-09-25

2,400 rows, one for every row in your file, each with its outcome and the date it was established.

…_stopped-rows_v01.csv FILE 3 OF 7

The stopped rows

Every row we stopped or kept aside on your protected list, with the reason and the date. Put any of them back if you disagree. It is your list.

AS IT ARRIVED
J. Hackworth, Recruitment Consultant, Ormsby Combe Partners Ltd, jasonhackworth@•••••.co.uk
WHAT WE FOUND
Address is flagged for abuse complaints. Sending risks your sender reputation. No other working way to reach this person was found.
DATE CHECKED
2026-09-28
WHERE IT ENDED UP
Stopped, with the reason recorded beside it.

325 in your stopped rows, each carrying the reason: 303 marked STOPPED, 22 marked PROTECTED.

…_changelog_v01.csv FILE 5 OF 7

The changelog: what we changed, what we found and left in place, with the reason and the date

Every change, every removal, and every difference we found and left in place. The reason and the date checked.

444 entries, each carrying the reason and the date we checked it.

FILE 6 OF 7

The withheld addresses, in the shape of the destination you name

The addresses kept out of the send, in the shape your sending tool loads.

The free check runs the email, phone and identity checks on up to 300 rows you choose.

An example full check. The organisations and people in it are invented and the figures are illustrative, not measured.

The machinery

Four things the full check does that are easy to miss

Account protection

Your own clients, held apart

Tell us which organisations are your own clients , which are competitors and which you are in a deal with, and those rows are kept aside on your instruction, with the reason, out of the list you are about to work.

Where the check finds a new employer for someone, the match runs again against it, so somebody who has moved into an organisation on your protected list, a client or a competitor, is caught even when the row you sent named a different employer.

The link we find

When a row arrives with no LinkedIn URL, we go looking with the first name, the surname, the role on your row and the work email domain. What comes back is checked against the name, employer and role you sent us. A strong match is written into your file. A middling one is held back for a person to look at, and if nobody can stand it up it is dropped. A weak one is dropped and the rejection is recorded against that row. The cell stays empty rather than carrying a link we cannot back.

Contacts you have sent before

A contact you sent us in an earlier list, inside a freshness window, is recognised, and our earlier check is reused rather than run again.

The wrong-person guard

Where the evidence establishes that the person found is not the person on your row, the row is stopped: it leaves your working file and is listed in the stopped rows with that reason. Where a possible profile could not be tied to the person, none of its details are used.

Where to start

Send us the client list you trust least and pick a call slot. We run it the day before: each email address checked for mail, each mobile number checked for a live line, and each person checked against the role on your row, up to 300 rows. On the call we show you three numbers: how many would be in your working file, how many were stopped, and how many raised a question, with what we decided. Then we walk your own rows through with you. No cost, and if nothing in there surprises you we stop.

Send your list

The free check takes one file of up to 300 rows, chosen by you.