Context.IO provides API access to core resources in IMAP-enabled mailboxes such as messages, contacts, threads and attachments, and provides webhooks to manage

Context.IO provides API access to core resources in IMAP-enabled mailboxes such as messages, contacts, threads and attachments, and provides webhooks to manage all of these. Apps can be notified of specific content as it arrives, instead of constantly polling a mailbox for matching content. Makes development of apps that look for and push important messages much much easier. http://context.io/docs/2.0/accounts/webhooks http://context.io/docs/2.0/accounts/webhooks Full disclosure, I do Community Management/Developer Relations for Context.IO.