IMAP4rev1
IMAP4rev1 is the revision one of the Internet Message Access Protocol (IMAP) used for accessing email on a mail server. It was introduced in 1994 as part of RFC 2177 and became the de‑facto standard for email retrieval and management, superseding the earlier IMAP2 protocol. The protocol enables clients to access and manipulate messages stored on the server without locally downloading them, supporting features such as mail folder hierarchies, message flags, search, and incremental updates.
The primary design goals of IMAP4rev1 were scalability, flexibility, and efficiency. It uses a client–server model
Security and privacy measures in IMAP4rev1 include optional authentication methods (CRAM‑MD5, DIGEST‑MD5, and OAuth2) and Transport