| API | Description | Category | Date |
|---|---|---|---|
| Shareaholic | Social link-sharing service | Social | 2010-08-26 |
| Shortmail | Length limited email service | 2012-03-08 | |
| Signal | Interactive mobile and email marketing platform | Messaging | 2010-12-10 |
| Silentale | Consolidate contacts and messages in a personal archive | Tools | 2010-11-01 |
| Silverpop | Marketing automation service | 2012-01-09 | |
| SocketLabs Email On Demand | Hosted on demand email service | 2010-03-24 | |
| SoundBite | Unified messaging service for voice, text, and email | Telephony | 2008-11-22 |
| SpamOn | Disposable email address service | 2011-08-30 | |
| StesCodes Contact Grabber | Address book data extraction service | Social | 2011-12-09 |
| StoreMail | E-mail marketing service | 2012-04-10 | |
| StreamSend | Email marketing service | 2011-02-15 | |
| StrikeIron Email Verification | Email verification service | 2006-09-29 | |
| SubscriberMail | Email marketing service | 2008-08-09 | |
| SupportBreeze | Support email tracking service | 2011-02-08 | |
| Taskforce | Service that converts emails to tasks | PIM | 2011-08-29 |
| TekGuard Product Info | E-mail security product information service | Security | 2012-04-12 |
| Topica | Email marketing service | 2011-11-29 | |
| Toutapp | Email template and campaign service | 2011-08-29 | |
| UCRUX | Email Marketing Software Service | 2010-08-17 | |
| Undisposable | Collaborative protection against disposable email | 2007-11-12 |
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