Move email APIs to Email section

Moved:
- ImprovMX
- mail.gw
- mail.tm
- MailboxValidator

README.md

@@ -270,11 +270,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Freelancer](https://developers.freelancer.com/docs) | Hire freelancers to get work done | `OAuth` | Yes | Unknown |
 | [Gmail](https://developers.google.com/gmail/api/) | Flexible, RESTful access to the user's inbox | `OAuth` | Yes | Unknown |
 | [Google Analytics](https://developers.google.com/analytics/) | Collect, configure and analyze your data to reach the right audience | `OAuth` | Yes | Unknown |
-| [ImprovMX](https://improvmx.com/api) | API for free email forwarding service | `apiKey` | Yes | Unknown |
 | [Instatus](https://instatus.com/help/api) | Post to and update maintenance and incidents on your status page through an HTTP REST API | `apiKey` | Yes | Unknown |
-| [mail.gw](https://docs.mail.gw) | 10 Minute Mail | No | Yes | Yes |
-| [mail.tm](https://docs.mail.tm) | Temporary Email Service | No | Yes | Yes |
-| [MailboxValidator](https://www.mailboxvalidator.com/api-email-free) | Validate email address to improve deliverability | `apiKey` | Yes | Unknown |
 | [Mailchimp](https://mailchimp.com/developer/) | Send marketing campaigns and transactional mails | `apiKey` | Yes | Unknown |
 | [mailgun](https://www.mailgun.com/) | Email Service | `apiKey` | Yes | Unknown |
 | [mailjet](https://www.mailjet.com/) | Marketing email can be sent and mail templates made in MJML or HTML can be sent using API | `apiKey` | Yes | Unknown |
@@ -640,7 +636,11 @@ API | Description | Auth | HTTPS | CORS |
 | [DropMail](https://dropmail.me/api/#live-demo) | GraphQL API for creating and managing ephemeral e-mail inboxes | No | Yes | Unknown |
 | [EVA](https://eva.pingutil.com/) | Validate email addresses | No | Yes | Yes |
 | [Guerrilla Mail](https://www.guerrillamail.com/GuerrillaMailAPI.html) | Disposable temporary Email addresses | No | Yes | Unknown |
+| [ImprovMX](https://improvmx.com/api) | API for free email forwarding service | `apiKey` | Yes | Unknown |
 | [Kickbox](https://open.kickbox.com/) | Email verification API | No | Yes | Yes |
+| [mail.gw](https://docs.mail.gw) | 10 Minute Mail | No | Yes | Yes |
+| [mail.tm](https://docs.mail.tm) | Temporary Email Service | No | Yes | Yes |
+| [MailboxValidator](https://www.mailboxvalidator.com/api-email-free) | Validate email address to improve deliverability | `apiKey` | Yes | Unknown |
 | [MailCheck.ai](https://www.mailcheck.ai/#documentation) | Prevent users to sign up with temporary email addresses | No | Yes | Unknown |
 | [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 |