Add Email section with Mailchimp, Sendgrid and Sendinblue (#2772)

README.md

@@ -71,6 +71,7 @@
 * [Development](#development)
 * [Dictionaries](#dictionaries)
 * [Documents & Productivity](#documents--productivity)
+* [Email](#email)
 * [Entertainment](#entertainment)
 * [Environment](#environment)
 * [Events](#events)
@@ -596,6 +597,14 @@ API | Description | Auth | HTTPS | CORS |
 | [WakaTime](https://wakatime.com/developers) | Automated time tracking leaderboards for programmers | No | Yes | Unknown |
 | [Zube](https://zube.io/docs/api) | Full stack project management | `OAuth` | Yes | Unknown |
 
+**[⬆ Back to Index](#index)**
+### Email
+API | Description | Auth | HTTPS | CORS |
+|---|---|---|---|---|
+| [Mailtrap](https://mailtrap.docs.apiary.io/#) | A service for the safe testing of emails sent from the development and staging environments | `apiKey` | Yes | Unknown |
+| [Sendgrid](https://sendgrid.com/docs/api-reference/) | A cloud-based SMTP provider that allows you to send emails without having to maintain email servers | `apiKey` | Yes | Unknown |
+| [Sendinblue](https://developers.sendinblue.com/docs) | A service that provides solutions relating to marketing and/or transactional email and/or SMS | `apiKey` | Yes | Unknown |
+
 **[⬆ Back to Index](#index)**
 ### Entertainment
 API | Description | Auth | HTTPS | CORS |