IMAP vs. SMTP: Differences Between the Protocols Explained

SMTP and IMAP are complementary email protocols that handle different stages of email communication: SMTP sends messages from clients to mail servers and between servers, while IMAP retrieves, stores, and synchronizes messages from servers across multiple email clients. SMTP uses a TCP-based handshake and commonly operates on ports 25, 465, 587, or 2525, with port 587 generally preferred for secure client submission through STARTTLS. IMAP allows users to view, organize, search, and manage server-stored mail across devices, typically using unsecured port 143 or encrypted port 993. Because SMTP delivers outgoing mail and IMAP provides access to incoming mail, they normally work together rather than serving as alternatives. POP3 is presented as an alternative to IMAP that downloads messages to a single device and may remove them from the server, making it useful in some situations with limited or unreliable internet access.

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