Format · Emails

Mask email archives without losing the thread

Email carries more personal data than almost anything a company keeps: signatures, forwarded threads, phone numbers and attachments. Teams need it to test case-management and AI tools, and to share or sell archives, but not with the real people in it.

Re: Claim 88-1042Masked in your VPCIllustration
Before
From: Maria Lopez <m.lopez@example.com> Hi Tom, my new number is 07700 900123. Maria
After
From: Ava Okafor <a.okafor@example.net> Hi Sam, my new number is 07700 900456. Ava
Found in this file
Treatment
Sender name and address×1Consistent
First names×2Consistent
Phone number×1Keep format
Claim reference×1Keep
Policy: Customer data v3 Labelled-sample check passed

What's in an email archive

Sender and recipient addressesSignaturesQuoted repliesPhone numbersAttachmentsCustomer and staff namesAccount references
Why now

Email archives are now wanted for AI training, data deals and investigations, and every one of them needs the people taken out first.

What you can do

Engineer-ledAttachmentsPDF, DOCX and PPTX attachments exported in ZIP archives can be masked with document masking now.
Engineer-ledWhole mailboxesBodies, headers, quoted replies and attachments, including text inside attached images. Our engineers set the policy with you.
Engineer-ledSynthetic email threadsGenerate realistic threads for synthetic customers to test triage, routing and AI assistants.

The hard parts

  • A signature that says only "Maria" has to become "Ava", not stay as it is.
  • Quoted replies repeat the same details many times in one message.
  • “Mental health” as a topic is not the same as “she was treated for anxiety”. How strictly topic mentions are masked is a policy setting you choose.
  • Spelling and case variants of a name are linked across the archive automatically. Nicknames and first-name-only references still need labelled checks.

Questions about email masking

Can you mask EML, MSG or PST files?

Mailbox exports with attachments have been de-identified for customers in projects run with our engineers. Synthetic email threads are delivered the same way.

Will a reply chain keep the same replacement names?

Within one archive, yes. Spelling and case variants of each name are linked across files, so each person or organisation gets one replacement. You decide the grouping, for example whether a company and its brands count as one organisation.

Can I prove to a buyer that the archive is clean?

No tool can prove that nothing was missed. What you can show is what was found and treated per category, and how a labelled sample scored. See data sharing and licensing.

The platform underneath, in production

Documents run on the same platform banks and insurers already trust with their test data.

Documents and text use the same policies, the same engine and the same deployment as these results.

Banking · test data80%less time to provision test data, with compliant data generated through the API inside CI/CD.Deutsche BankCase study
Insurance · security0security waivers across 14 priority applications: 28M+ rows secured, 100% referential integrity, test data 60% faster.Global specialty insurerCase study

Published results from database and synthetic data work on the Synthesized platform.

Have an archive to clean?

Bring one mailbox export. We set the policy with you, run it, and hand over a policy you can re-run.

Get a 48-hour proof