emerging · 0.4

Mail

Score 21.7 / 100 37 providers 39 APIs Search apis.io →
Variants seen in the corpus: Mailmail

Providers using this tag (37)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 1 Complete, well-documented, and agent-ready
Lob.comCompanyDirect MailPrintAddress Verification32 APIs67.5
Strong 2 Solid coverage with minor gaps
KiteworksCompanySecure File SharingManaged File TransferSecure Email41 APIs60.1Microsoft Office 365CloudCollaborationEnterpriseMicrosoft12 APIs54.8
Developing 8 Usable, with meaningful gaps to close
ZoomChatCollaborationCommunicationsMeetings47 APIs51.1KU LeuvenUniversityHigher EducationEducationBelgium49 APIs50.7University of British ColumbiaEducationHigher EducationUniversityPublic Research University7 APIs49.2MicrosoftFortune 10059 APIs47.8Microsoft OfficeCollaborationDocumentsMicrosoftOffice9 APIs47.0CCP GamesCompanyGamingGamesMMO31 APIs45.0EVE OnlineAuthenticationAuthorizationGamingImage50 APIs40.5Zoho MailEmailCollaborationMessaging4 APIs39.6
Thin 22 Limited public surface area
ZohoAnalyticsCollaborationCRMCustomer Service34 APIs38.5MoseyCompanyComplianceRegulatory TechnologyState Compliance12 APIs36.9Norwegian University of Science and TechnologyEducationHigher EducationUniversityResearch39 APIs36.4Microsoft 365ProductivityCollaborationEmailCalendar9 APIs34.8Microsoft Office ApplicationsDocumentsOfficePresentationsProductivity10 APIs34.2Microsoft Office SuiteCloudCollaborationDocumentsMicrosoft-36510 APIs33.9University of GroningenEducationHigher EducationUniversityResearch75 APIs33.6Microsoft Products APIsAzureCloudEnterpriseMicrosoft14 APIs33.1University of GöttingenEducationHigher EducationUniversityResearch Data35 APIs32.1Microsoft ProductsCloudEnterpriseMicrosoftProductivity9 APIs32.0Microsoft Office ProductsCloudEnterpriseMicrosoftOffice9 APIs31.4University of North Carolina at Chapel HillEducationHigher EducationUniversityResearch Data39 APIs31.2Microsoft SuiteCloudEnterpriseProductivitySoftware-as-a-Service13 APIs30.8Microsoft Office Pack9 APIs30.4Office 365CloudCollaborationDocumentsEmail5 APIs30.1Maastricht UniversityEducationHigher EducationUniversityResearch38 APIs30.0DHLFreightLogisticsShippingE-Commerce51 APIs29.5National Yang Ming Chiao Tung UniversityEducationHigher EducationUniversityTaiwan25 APIs29.5UCLouvainEducationHigher EducationUniversityOpen Data39 APIs29.3Queen's University at KingstonEducationHigher EducationUniversityOpen Data38 APIs28.6Tecnológico de MonterreyEducationHigher EducationUniversityOpen Data25 APIs28.3University of ChileEducationHigher EducationUniversityResearch Data25 APIs26.7
Emerging 4 Early or largely undocumented
Université de MontréalEducationHigher EducationUniversityResearch38 APIs25.9Tithe.lyChurch GivingDonationsFundraisingPayments6 APIs25.0PigeonlyCompanyInmate CommunicationCorrectionsPrison Calls16.4Microsoft ApplicationsCloudCollaborationEnterpriseMicrosoft9 APIs16.2

APIs with this tag (38)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 2 Solid coverage with minor gaps
Kiteworks mail APIThe mail API from Kiteworks — 29 operation(s) for mail.60.1Microsoft Office 365 Mail APIAccess and manage Outlook mail messages, mail folders, and message attachments. Supports reading, creating,...54.8
Developing 6 Usable, with meaningful gaps to close
Zoom Mail APIThe Zoom Mail API enables developers to programmatically access and manage mailbox data including draft man...51.1KU Leuven Mail APIThe Mail API from KU Leuven — 1 operation(s) for mail.50.7Microsoft Mail APIAccess and manage Outlook mail messages and folders47.8Microsoft Office Mail APIThe Mail API from Microsoft Office — 4 operation(s) for mail.47.0CCP Games Mail APIThe Mail API from CCP Games — 5 operation(s) for mail.45.0EVE Online Mail APIThe Mail API from EVE Online — 13 operation(s) for mail.40.5
Thin 27 Limited public surface area
Zoho MailThe Zoho Mail REST API allows developers to fetch email conversations and integrate Zoho Mail into applicat...38.5Mosey Mail APIThe Mail API from Mosey — 2 operation(s) for mail.36.9Norwegian University of Science and Technology Mail APIThe Mail API from Norwegian University of Science and Technology — 1 operation(s) for mail.36.4Microsoft 365 Mail APIThe Mail API from Microsoft 365 — 1 operation(s) for mail.34.8Microsoft Graph APIUnified REST API providing a single endpoint to access data and intelligence across Microsoft 365, Microsof...34.8Microsoft Office Applications Mail APIThe Mail API from Microsoft Office Applications — 4 operation(s) for mail.34.2Outlook Mail APIAPI for accessing and managing email in Outlook.34.2Microsoft Office Suite Mail APIThe Mail API from Microsoft Office Suite — 4 operation(s) for mail.33.9University of Groningen Mail APIThe Mail API from University of Groningen — 1 operation(s) for mail.33.6Microsoft Products APIs Mail APIOutlook mail messages for the signed-in user.33.1University of Göttingen Mail APIThe Mail API from University of Göttingen — 1 operation(s) for mail.32.1Microsoft Products Mail APIThe Mail API from Microsoft Products — 4 operation(s) for mail.32.0Microsoft Office Products Mail APIThe Mail API from Microsoft Office Products — 4 operation(s) for mail.31.4University of North Carolina at Chapel Hill Mail APIThe Mail API from University of North Carolina at Chapel Hill — 1 operation(s) for mail.31.2Microsoft Suite Mail APIThe Mail API from Microsoft Suite — 2 operation(s) for mail.30.8Microsoft Office Pack Mail APIThe Mail API from Microsoft Office Pack — 4 operation(s) for mail.30.4Microsoft Graph APIThe primary API for Office 365, providing access to data and intelligence in Microsoft 365, Windows 10, and...30.1Outlook Mail APIAccess email, manage folders, send mail, and manage mail settings via Microsoft Graph.30.1Maastricht University Mail APIThe Mail API from Maastricht University — 1 operation(s) for mail.30.0Deutsche Post Hybrid Mail Shipments E-POSTAllows business customers to send PDF documents as physical mail shipments via Deutsche Post with tracking.29.5Deutsche Post InternationalCreates labels for international mail, lightweight items, and merchandise shipments via Deutsche Post.29.5Deutsche Post Print-Mailing Dispatch PreparationManages dialogue marketing print mailings including pricing, documents, and franking workflows.29.5National Yang Ming Chiao Tung University Mail APIThe Mail API from National Yang Ming Chiao Tung University — 1 operation(s) for mail.29.5UCLouvain Mail APIThe Mail API from UCLouvain — 1 operation(s) for mail.29.3Queen's University at Kingston Mail APIThe Mail API from Queen's University at Kingston — 1 operation(s) for mail.28.6Tecnológico de Monterrey Mail APIThe Mail API from Tecnológico de Monterrey — 1 operation(s) for mail.28.3University of Chile Mail APIThe Mail API from University of Chile — 1 operation(s) for mail.26.7
Emerging 3 Early or largely undocumented
Université de Montréal Mail APIThe Mail API from Université de Montréal — 1 operation(s) for mail.25.9Tithe.ly Mail APISend templated transactional email.25.0Microsoft Graph APIUnified API endpoint for accessing Microsoft 365, Windows 10, and Enterprise Mobility + Security services.16.2

Score breakdown

Frequency
51.6
log-scaled weighted occurrences
Breadth
1.0
spread across providers
Quality lift
42.8
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

Datatags 13 co-occurrences Builtin Users 13 co-occurrences Metadatablocks 13 co-occurrences Mydata 13 co-occurrences Pids 13 co-occurrences Dataverses 13 co-occurrences Harvest 13 co-occurrences Edit 13 co-occurrences

Where this tag comes from

Api tag39
Provider tag3
Openapi tag27
Openapi op tag74

Cohort brief

Auto-generated

The 37 providers in the APIs.io catalog tagged Mail, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
37
all scored
Mean Kin Score
36.2
+15.5 vs catalog 20.7
Mean Agent Readiness
25.2
+15.5 vs catalog 9.7
Spread
16.2–67.5
median 33.1 · σ 11
How the 37 split by band
Exemplar 1Strong 2Developing 8Thin 22Emerging 4Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 48.2 17.5 +30.7 37
Access Clarity 37 22.3 +14.7 37
Operational Transparency 24.6 11.3 +13.3 37
Developer Ergonomics 28.2 17.9 +10.3 37
Discoverability 64.8 60.4 +4.4 37
Contract Governance 8.1 6.4 +1.7 37

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 19% 16% +3
MCP server (first-party) 5% 7% -2
Agent Skills 0% 0% 0
OAuth scopes 49% 9% +40
Security 97% 88% +9
Arazzo workflows 8% 2% +6
Governance rules 46% 13% +33

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Lob.com 67.5
  2. 2 Kiteworks 60.1
  3. 3 Microsoft Office 365 54.8
  4. 4 Zoom 51.1
  5. 5 KU Leuven 50.7
  6. 6 University of British Columbia 49.2
  7. 7 Microsoft 47.8
  8. 8 Microsoft Office 47
  9. 9 CCP Games 45
  10. 10 EVE Online 40.5
Top by Agent Readiness
  1. 1 Kiteworks 37.9
  2. 2 Lob.com 37.9
  3. 3 EVE Online 34.9
  4. 4 Zoom 34.1
  5. 5 Microsoft Office 365 32.4
  6. 6 Microsoft Office 32.2
  7. 7 University of Groningen 30.9
  8. 8 KU Leuven 30.2
  9. 9 CCP Games 29.3
  10. 10 Microsoft Products APIs 28.7
All 37 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 25 August 2026, across 26891 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

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