IMAPlle
IMAPlle is a term that appears to be a misspelling or a portmanteau related to IMAP, which stands for Internet Message Access Protocol. IMAP is an internet protocol used by email clients to retrieve email messages from a mail server. It allows users to access their email from multiple devices and keep them synchronized. Unlike POP3, IMAP downloads emails from the server and stores them locally, but also leaves a copy on the server, enabling access from various clients.
If "IMAPlle" refers to a specific software application or service, it is not widely recognized or documented