What are the Types of mail servers?

There are several types of mail servers, primarily categorized by their roles in handling email. SMTP servers (Simple Mail Transfer Protocol) are responsible for sending and relaying outgoing email. IMAP servers (internet Message Access Protocol) allow users to access and manage their emails on the server, supporting multiple devices. POP3 servers (Post Office Protocol) download emails to a local client, allowing offline access but typically removing them from the server. Additionally, there are specialized servers for spam filtering, archiving, and other functions that enhance email management.