Atmail includes a comprehensive JSON API to access email, calendaring & contact data, allowing you to build this data into your own applications, create mobile interfaces, mashup to a portal and more.

How to create an Atmail Plugin - A quickstart tutorial - https://www.youtube.com/watch?v=5XnlHCqjtE8

Plugins Help - https://help.atmail.com/hc/en-us/articles/203020794-Plugins-Help

Creating Plugins - https://help.atmail.com/hc/en-us/articles/203020804-Creating-Plugins

Barracuda4Atmail Plugin - https://help.atmail.com/hc/en-us/articles/203020854-Barracuda4Atmail-Plugin

ChangePassword Plugin - https://help.atmail.com/hc/en-us/articles/203253780-ChangePassword-Plugin

CSRLogin Plugin - https://help.atmail.com/hc/en-us/articles/203253790-CSRLogin-Plugin

FirstLoginTrigger Plugin - https://help.atmail.com/hc/en-us/articles/203020864-FirstLoginTrigger-Plugin

FromAddress Plugin - https://help.atmail.com/hc/en-us/articles/203020874-FromAddress-Plugin

LoginCaptcha Plugin - https://help.atmail.com/hc/en-us/articles/203253800-LoginCaptcha-Plugin

MailOptions Plugin - https://help.atmail.com/hc/en-us/articles/203253810-MailOptions-Plugin

MailOS Plugin - https://help.atmail.com/hc/en-us/articles/203020884-MailOS-Plugin

MailTube Plugin - https://help.atmail.com/hc/en-us/articles/203020894-MailTube-Plugin

ManageSieve Plugin - https://help.atmail.com/hc/en-us/articles/203020904-ManageSieve-Plugin

MapIt Plugin - https://help.atmail.com/hc/en-us/articles/203020914-MapIt-Plugin

PreviewPopup Plugin - https://help.atmail.com/hc/en-us/articles/203020924-PreviewPopup-Plugin

SpamSettings Plugin - https://help.atmail.com/hc/en-us/articles/203020944-SpamSettings-Plugin

TimeFormat Plugin - https://help.atmail.com/hc/en-us/articles/203253830-TimeFormat-Plugin