Exclaimer

Exclaimer is an email signature management platform used by IT, marketing, and sales teams to centrally create, deploy, and govern corporate email signatures across Microsoft 365, Microsoft Exchange, and Google Workspace. It manages signatures for more than 9 million email accounts, adding campaign banners, meeting-branding backgrounds, click-tracking analytics, directory synchronization with Azure AD and Google Directory, and role-based access control. Exclaimer does not publish a public developer API reference, but operates a multi-region Exclaimer Cloud with a real-time status page and a strong security and compliance program (SOC 2 Type II, ISO 27001/27018, HIPAA, PCI DSS, CSA STAR, Cyber Essentials).

Exclaimer is profiled on the APIs.io network. Tagged areas include Company, Email, Email Signatures, Email Signature Management, and Microsoft 365.

Exclaimer’s developer surface includes pricing, engineering blog, signup flow, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

23.6/100 emerging ▬ flat Agent 7/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessApproval

0 APIs

CompanyEmailEmail SignaturesEmail Signature ManagementMicrosoft 365Google WorkspaceMarketingProductivitySaaSSecurity

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 23.6/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 12.1 / 20

Operational Transparency 3.4 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 7/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 3 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/exclaimer: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Access & Security 6

Authentication, authorization, and security posture

Compliance

Compliance

TrustCenter

TrustCenter

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

HelpCenter

HelpCenter

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: exclaimer
name: Exclaimer
description: Exclaimer is an email signature management platform used by IT, marketing, and sales teams to centrally create,
  deploy, and govern corporate email signatures across Microsoft 365, Microsoft Exchange, and Google Workspace. It manages
  signatures for more than 9 million email accounts, adding campaign banners, meeting-branding backgrounds, click-tracking
  analytics, directory synchronization with Azure AD and Google Directory, and role-based access control. Exclaimer does not
  publish a public developer API reference, but operates a multi-region Exclaimer Cloud with a real-time status page and a
  strong security and compliance program (SOC 2 Type II, ISO 27001/27018, HIPAA, PCI DSS, CSA STAR, Cyber Essentials).
accessModel:
  pricing: unknown
  onboarding: approval
  trial: false
  try_now: false
  public: false
  label: Requires approval
  confidence: medium
  source: []
  generated: '2026-07-22'
  method: derived
image: https://exclaimer.com/img/og-image.jpg
url: https://raw.githubusercontent.com/api-evangelist/exclaimer/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- insight-partners
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Email
- Email Signatures
- Email Signature Management
- Microsoft 365
- Google Workspace
- Marketing
- Productivity
- SaaS
- Security
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://exclaimer.com/
- type: Pricing
  url: https://exclaimer.com/pricing/
- type: Blog
  url: https://exclaimer.com/blog/
- type: SignUp
  url: https://go.exclaimer.com/trial
- type: HelpCenter
  url: https://support.exclaimer.com/hc/en-gb
- type: TermsOfService
  url: https://exclaimer.com/legal/website-terms-of-use/
- type: PrivacyPolicy
  url: https://exclaimer.com/legal/privacy-policy/
- type: StatusPage
  url: https://status.exclaimer.com/
- type: Lifecycle
  url: lifecycle/exclaimer-lifecycle.yml
- type: Compliance
  url: https://exclaimer.com/product/security/
- type: TrustCenter
  url: security/exclaimer-trust-center.yml
- type: Security
  url: https://vdp.exclaimer.com/p/Welcome
- type: VulnerabilityDisclosure
  url: security/exclaimer-vulnerability-disclosure.yml
- type: SecurityTxt
  url: well-known/exclaimer-security.txt
- type: WellKnown
  url: well-known/exclaimer-well-known.yml
- type: DomainSecurity
  url: security/exclaimer-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Exclaimer

Kin Score

Security Posture 3

Exclaimer Domain Security

Exclaimer Vulnerability Disclosure

Exclaimer Trust Center

Resources