| API | Description | Category | Date |
|---|---|---|---|
| 18amail | Email marketing service | 2010-01-18 | |
| ActiveCampaign | Email marketing service | 2010-03-13 | |
| AddressTwo | Small business CRM service | Enterprise | 2011-02-15 |
| AOL Open Mail | Email services | 2008-01-08 | |
| AppShore | Small business CRM service | Enterprise | 2011-02-15 |
| Apsis Newsletter Pro | Email newsletter management service | 2012-12-13 | |
| AtMail | Webmail Service | 2012-10-29 | |
| AWeber Email Marketing | Email Marketing Service | Advertising | 2010-12-01 |
| BlinkCampaign | Social Media and Email Marketing platform | 2011-07-05 | |
| BriteVerify | Realtime email data verification | 2011-07-07 | |
| BYU Email Verification | University email verification service | 2013-01-10 | |
| CakeMail | Email marketing service | 2009-03-14 | |
| Cambridge Lookup/Ibis Web Service | Online Contact Retrieval Service | Reference | 2012-07-13 |
| Campaign Monitor | Email List and Campaign management service | 2008-07-18 | |
| Campaigner Elements | Email marketing campaign management service | 2013-03-11 | |
| Click2mail | web-based email service | 2011-11-08 | |
| Close.io | Sales communication application | Enterprise | 2013-06-11 |
| ConnectYard | Social messaging service | Messaging | 2013-02-22 |
| ConstantContact | Email marketing service | 2009-02-14 | |
| Contactology | Best Email Marketing API | 2008-12-07 |
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