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| API | Description | Category | Date |
|---|---|---|---|
| AOL Open Mail | Email services | 2008-01-08 | |
| Bronto | Email marketing service | 2008-10-29 | |
| Campaign Monitor | Email List and Campaign management service | 2008-07-18 | |
| Email Address Validator | Email address validation service | 2006-11-11 | |
| Email2HTTP | Email delivery services | 2008-01-04 | |
| ExactTarget | Email delivery services | 2006-06-13 | |
| FeedBlitz | Blogs by email service | Blogging | 2006-12-26 |
| FraudLabs MailBox Validator | Email address validation service | 2008-10-05 | |
| Google Apps Email Migration | Migrate existing email systems to Google Apps | 2007-11-18 | |
| Google Email Settings | Allows administration of Google Apps email accounts | 2008-10-16 | |
| Google Provisioning | User provisioning for Google Apps | Enterprise | 2007-02-23 |
| IIG Alerts | Voice, SMS and Email messaging | Messaging | 2008-10-15 |
| IntelliContact | Email marketing service | 2007-05-15 | |
| Interfax | Fax services | Fax | 2006-08-31 |
| JangoMail | Bulk email service | 2006-08-20 | |
| Mailbuild | Email forms and templates service | 2007-04-15 | |
| MailChimp | Email List & Campaign management service | 2007-12-21 | |
| Mailtrust | Email hosting service | 2008-08-09 | |
| Orange Email | Email service | 2008-02-10 | |
| PGiConnect | Email, messaging, and conferencing services | Messaging | 2008-11-08 |