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Mailosaur: what they publish

mailosaur.com · Transactional email and notifications · checked 2026-10-18

74/100BBand B

Rank 2 of 30 in Transactional email and notifications, where the median is 24.

Public transparency score, not a product or security rating. Latest check: 2026-10-18. How the score works.

Evidence at a glance

Choose a check to see its source, date and scope.

Not found means not found at the addresses we checked. Not measured means we could not complete the check.

Start a vendor reviewDownload evidence (CSV)

Overview

1 day since the newest dated result, 1 since the oldest. 12 of 12 criteria have a measured result in the last 30 days. Failed checks and undated results are excluded.

Evidence freshness is a statement about our measurement and is kept apart from the transparency score, which is frozen at v1. How good our own measurement is.

Transparency labelsaas-ranking.com

Mailosaur

mailosaur.com · Transactional email and notifications

  1. A
  2. B
  3. C
  4. D
  5. E
  6. F
B 74of 100 Rank 2 of 30

Published commitments8 of 9 found

Measured behaviour1 of 3 found

Checked 2026-10-18. Every line links the page we found it on. A cross means we found nothing at the addresses we checked, not that the vendor has no such document. A transparency score, not a product rating.

Downloads include all checks, source URLs, dates and the snapshot ID for your procurement file. We do not issue badges.

The label is the whole measurement in one object: every criterion with its weight, the band, and the date. Public transparency score, not a product or security rating.

Every line in it links the page we found the result on, or lists the addresses we checked. A cross means we found nothing there, not that Mailosaur has no such document.

Where Mailosaur sits in Transactional email and notifications

  1. A0 0%
  2. B2 7%
  3. C2 7%
  4. D5 17%
  5. E6 20%
  6. F15 50%
30 vendors with a score; 3 more without a score because we could measure too little. Bands have fixed thresholds, see how the score works.

The band of Mailosaur is marked. Vendors without a score are the ones where we could measure too few criteria to rank them – a gap on our side, counted separately.

What Mailosaur states

The exact figures and names we read off the pages linked below, with the sentence they stand in. This is what they publish, not what we verified about their systems.

Gaps, heaviest first

✗

Data processing agreement (DPA)

weight 3 of 3

We found this behind a sign-in, so it is not published openly.

Seen at https://mailosaur.com/legal/privacy · checked 2026-10-18

Show the 8 addresses we checked
  1. https://mailosaur.com/legal/dpa – reached, no match (HTTP 404)
  2. https://mailosaur.com/dpa – reached, no match (HTTP 404)
  3. https://mailosaur.com/legal/data-processing-agreement – reached, no match (HTTP 404)
  4. https://mailosaur.com/data-processing-agreement – reached, no match (HTTP 404)
  5. https://mailosaur.com/legal/data-processing-addendum – reached, no match (HTTP 404)
  6. https://mailosaur.com/legal/gdpr – reached, no match (HTTP 404)
  7. https://mailosaur.com/trust/dpa – reached, no match (HTTP 404)
  8. https://mailosaur.com/privacy/dpa – found, but behind a sign-in

Is this wrong? Send us the URL

Across the market: Data processing agreement in Transactional email and notifications: 7 of 31 companies

✗weight 2 of 3

Third-party requests seen on the first load, before any interaction.

  • Third-party hosts we saw on the first load 1 statuspage.io.
    Show the exact wording

    77ny65ssgfhb.statuspage.io

    Read at https://mailosaur.com/

Checked 1 address on 2026-10-18.

Show the 1 address we checked
  1. https://mailosaur.com/ – third-party requests before any interaction: 77ny65ssgfhb.statuspage.io

Is this wrong? Send us the URL

Across the market: No third-party tracking before consent in Transactional email and notifications: 3 of 32 companies

✗

security.txt (RFC 9116)

weight 1 of 3

No security.txt found.

Checked 1 address on 2026-10-18.

Show the 1 address we checked
  1. https://mailosaur.com/.well-known/security.txt – reached, no match (HTTP 404)

Is this wrong? Send us the URL

Across the market: security.txt (RFC 9116) in Transactional email and notifications: 4 of 31 companies

Evidence

The full source lists sit behind these two groups, so that the answer above stays readable.

Published, with a source 9
✓

Subprocessors: the published list

weight 3 of 3

The actual list is published, not just a promise to keep one.

Source: https://mailosaur.com/legal/subprocessors · checked 2026-10-18

Across the market: Subprocessor list in Transactional email and notifications: 7 of 31 companies

✓

Data location: where they say data is hosted

weight 3 of 3

The hosting location is stated on a public page.

  • Locations named next to the hosting wording European Union, United Kingdom. This does not establish the company’s headquarters.
    Show the 2 exact wordings

    ations Secure data protection Our data centers Our servers are hosted with Google Cloud Platform in data centers in the EU and the United Kingdom, chosen with security in mind.

    Read at https://mailosaur.com/security

    ations Secure data protection Our data centers Our servers are hosted with Google Cloud Platform in data centers in the EU and the United Kingdom, chosen with security in mind.

    Read at https://mailosaur.com/security

Source: https://mailosaur.com/security · checked 2026-10-18

Across the market: Data location stated in Transactional email and notifications: 9 of 31 companies

✓

Status page with incident history

weight 2 of 3

A public status page with incident history.

Source: https://status.mailosaur.com/ · checked 2026-10-18

Across the market: Status page with history in Transactional email and notifications: 8 of 32 companies

✓

Public pricing with figures

weight 2 of 3

Actual numbers on a public page.

Source: https://mailosaur.com/pricing · checked 2026-10-18

Across the market: Public pricing in Transactional email and notifications: 23 of 31 companies

✓

HTTPS enforced with HSTS

weight 2 of 3

HTTP redirects to HTTPS and the HSTS header is set.

  • HSTS max-age 31536000 seconds (365 days).
    Show the exact wording

    max-age=31536000; includeSubdomains; preload

    Read at https://mailosaur.com/
  • HSTS options includeSubDomains, preload.
    Show the 2 exact wordings

    max-age=31536000; includeSubdomains; preload

    Read at https://mailosaur.com/

    max-age=31536000; includeSubdomains; preload

    Read at https://mailosaur.com/

Source: https://mailosaur.com/ · checked 2026-10-18

Across the market: HTTPS enforced with HSTS in Transactional email and notifications: 21 of 33 companies

✓

Notice before subprocessors change

weight 2 of 3

The vendor commits publicly to giving notice before the list changes.

Source: https://mailosaur.com/legal/subprocessors · checked 2026-10-18

Across the market: Notice before subprocessors change in Transactional email and notifications: 8 of 31 companies

✓

Certifications named (SOC 2, ISO 27001)

weight 1 of 3

SOC 2 or ISO 27001 named on a public page.

  • Named on that page ISO/IEC 27001 (unclear from the sentence), PCI DSS.
    Show the 2 exact wordings

    GDPR, Data Protection Act, CCPA ISO27001:2022 certified PCI DSS compliant Adhering to cloud security assessments We are completely transpare

    Read at https://mailosaur.com/security

    GDPR, Data Protection Act, CCPA ISO27001:2022 certified PCI DSS compliant Adhering to cloud security assessments We are completely transparent when it comes to sec

    Read at https://mailosaur.com/security

Source: https://mailosaur.com/security · checked 2026-10-18

Across the market: Certifications named in Transactional email and notifications: 6 of 31 companies

✓

Uptime SLA with a figure

weight 1 of 3

An availability commitment with a figure.

  • Highest uptime figure on that page 99.9 %.
    Show the exact wording

    Uptime & Response/Resolution Time Guarantee Mailosaur agrees to maintain at least 99.9% Uptime for the Service.

    Read at https://mailosaur.com/legal/enterprise-sla

Source: https://mailosaur.com/legal/enterprise-sla · checked 2026-10-18

Across the market: Uptime SLA with a figure in Transactional email and notifications: 1 of 31 companies

✓

Named privacy contact (DPO or privacy address)

weight 1 of 3

A data protection officer or a dedicated privacy address is named.

Source: https://mailosaur.com/legal/privacy · checked 2026-10-18

Across the market: Named privacy contact in Transactional email and notifications: 9 of 31 companies

History

100 0 2026-10-11: 74 of 1002026-10-18: 74 of 100 2026-10-11 2026-10-18
Score over the last 2 runs we measured Mailosaur in: 74 (2026-10-11), 74 (2026-10-18).

Prepare your vendor review

A source is a starting point. Check the product, plan, legal entity and date before treating it as evidence for your purchase. These questions do not change the transparency score.

Mailosaur

9 found · 3 not found · 0 not measured across 12 public checks.

12 of 12 criteria have a measured result from the last 30 days. Oldest dated result: 2026-10-18.

Investigate 3 open evidence questions
  1. Data processing agreement

    Please share the current data processing agreement for the product and plan we are considering, including its annexes and signing process.

    Inspect this check
  2. No third-party tracking before consent

    Which third-party requests occur before a visitor makes a choice, and for what purpose? Please distinguish the public website from the product.

    Inspect this check
  3. security.txt (RFC 9116)

    Where should we report a vulnerability, and what acknowledgement and follow-up process should we expect?

    Inspect this check

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