Does anyone know of a mail server (imap) where the developper can be in control of the mail source? I wanted to expose one of our tool to mail clients, somethin

Does anyone know of a mail server (imap) where the developper can be in control of the mail source? I wanted to expose one of our tool to mail clients, something that handles all the imap talk and gives you onread/onmark/ondelete/... events, but I found very little libraries or servers for that kind of usage