Perplexity

1. 01Perplexity trains on data unless a business tier or opt-out is used. Verify which tier these users are on.
2. 022 signup emails show people creating Perplexity accounts with their work address. Those accounts live outside Entra, so leaving the company does not close them. Move users to the enterprise tier with SSO, or add a mail flow rule that flags vendor signups to the security team.

Metadata only: sender, recipient, subject, and time from Defender for Office 365. No mailbox content is read.

• ●Medium40PerplexityEndpoint0 people
• ●Medium45Perplexity: sensitive dataPurview DLP1 person
• ●Medium29PerplexityGoogle Workspace (demo)5 people

Identifiers come from device telemetry and proxy logs, so they may be account names rather than full directory entries.

1. vendor_email · Aug 31, 2026
   2 vendor emails from mail.perplexity.ai to 1 person in 30 days: 2 signup, 0 login, 0 billing
   Detail

   {
     "byKind": {
       "login": 0,
       "other": 0,
       "signup": 2,
       "billing": 0
     },
     "subjects": [
       "Welcome to Perplexity",
       "Confirm your email"
     ],
     "senderDomains": [
       {
         "count": 2,
         "domain": "mail.perplexity.ai"
       }
     ]
   }

2. mail_signup · Aug 31, 2026
   Signup: 'Welcome to Perplexity' to [email protected]
   Detail

   {
     "sender": "[email protected]",
     "messageId": "mail-0011"
   }

3. mail_signup · Aug 31, 2026
   Signup: 'Confirm your email' to [email protected]
   Detail

   {
     "sender": "[email protected]",
     "messageId": "mail-0012"
   }

4. corroboration
   Also found by another lane (mde:perplexity)
   Detail

   {
     "findingKey": "mde:perplexity"
   }