ImapKit

About

ImapKit is a scriptable IMAP server that runs in memory inside a test suite, so mail client code can be tested against real IMAP over a socket. It enforces the RFCs strictly, supports over 50 extensions, and lets tests add messages, change flags and script faults such as delayed responses or dropped connections. It can also run as a command with a REST API for use from Python, Go or other languages.