# Lettermint

Lettermint (lettermint.co): subprocessors, data processing agreement, security documents and changes, as monitored by Third Party Index.

- Page: https://thirdpartyindex.com/vendors/lettermint
- Documents last verified: 2026-09-30
- Transparency rating: 90/100 (how much it publishes, not how secure it is)
- Cite as: Lettermint, Third Party Index, https://thirdpartyindex.com/vendors/lettermint (data CC BY 4.0)

## Documents

| Document | URL | Last verified | Last changed |
|---|---|---|---|
| Trust center | https://trust.lettermint.co/ | 2026-09-30 | 2026-09-30 |
| Subprocessor list | https://trust.lettermint.co/subprocessors | 2026-09-30 | 2026-09-30 |
| Data processing addendum | https://lettermint.co/dpa | 2026-09-30 | 2026-09-30 |
| Privacy policy | https://lettermint.co/privacy-policy | 2026-09-30 | 2026-09-30 |
| Terms | https://lettermint.co/terms-of-service | 2026-09-30 | 2026-09-30 |
| security.txt | https://lettermint.co/.well-known/security.txt | 2026-09-30 | 2026-09-30 |
| Status page | https://status.lettermint.co/ | 2026-09-30 | 2026-09-30 |

## Subprocessors (12)

As its own list states them.

| Subprocessor | Purpose | Location | Listed since |
|---|---|---|---|
| [Aikido](https://thirdpartyindex.com/vendors/aikido-security.md) | Continuous security scanning of our infrastructure and source code.; Security | Europe | 2026-09-30 |
| Denovit | Finance and payments; Tooling for our administration | Netherlands | 2026-09-30 |
| Dool Administraties | Finance and payments; Our accountant | Netherlands | 2026-09-30 |
| [Exact](https://thirdpartyindex.com/vendors/exact.md) | Accounting and administration; Cloud-based accounting and financial administration. | Netherlands | 2026-09-30 |
| [Mistral](https://thirdpartyindex.com/vendors/mistral.md) | AI inference; Natural language processing for customer support. | Europe | 2026-09-30 |
| OVH Cloud | Cloud provider; Provider for our backup services. | Germany | 2026-09-30 |
| [PostHog](https://thirdpartyindex.com/vendors/posthog.md) | Product analytics | EEA | 2026-09-30 |
| Postmastery | Cloud monitoring; Deliverability and IP reputation monitoring | Netherlands | 2026-09-30 |
| [Slack](https://thirdpartyindex.com/vendors/slack.md) | Collaboration; Internal team communication and collaboration. | United States | 2026-09-30 |
| [Stripe](https://thirdpartyindex.com/vendors/stripe.md) | Finance and payments; Payment processing | United States / EEA | 2026-09-30 |
| [UpCloud](https://thirdpartyindex.com/vendors/upcloud.md) | Cloud provider; Provider for our Private Cloud infrastructure | Netherlands | 2026-09-30 |
| [Vanta](https://thirdpartyindex.com/vendors/vanta.md) | Continuous security and compliance monitoring; Security | Europe | 2026-09-30 |

Read from ([evidence](https://thirdpartyindex.com/evidence/25110)). CSV: https://thirdpartyindex.com/vendors/lettermint/subprocessors.csv

## Compliance

As its trust center lists them.

- Audited: ISO/IEC 27001 ([evidence](https://thirdpartyindex.com/evidence/25059))
- Claimed: GDPR ([evidence](https://thirdpartyindex.com/evidence/25059))

## Listed as a subprocessor by (1)

Tracked vendors whose own subprocessor lists name it, and what they say they use it for.

- [Phare](https://thirdpartyindex.com/vendors/phare.md)

## Service status

Incidents it reported on its own status page.

- Last 90 days: 5 reported incidents (2 major or critical, 3 minor, 0 with no impact stated)
- Typical time to resolve: 3 h 7 min
- 2026-09-23: Widespread platform outage (critical)
- 2026-09-01: API and SMTP relay degradation (minor)
- 2026-08-11: \[Blocklist\] Broadcast IP blocked with Outlook OLC (minor)
- 2026-07-23: Intermittent Timeouts Retrieving Inbound Emails and Attachments (minor)
- 2026-07-15: API availability issues (major)
- 2026-06-27: Increased error rates on the dashboard and Team API (minor)
- 2026-06-26: Elevated 500 errors with API authentication (major)
- 2026-06-23: \[Ratelimit\] Delayed sending to Outlook OLC (no impact stated)

## Security contact

From its security.txt (https://lettermint.co/.well-known/security.txt):

- Contact: mailto:security@lettermint.co
- Encryption key: https://keys.openpgp.org/vks/v1/by-fingerprint/532CE2A5DB8CBA2D1ABAD9C18CB8A2295887784D

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Third Party Index (https://thirdpartyindex.com) monitors vendors' public security and privacy documents and keeps each version as evidence. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); vendors' own documents are theirs. API: https://thirdpartyindex.com/api