


The number of users that the Debian mail server can carry is not a fixed value, but depends on the combined effect of many factors. These factors include server hardware configuration, network bandwidth, mail server software and its configuration, as well as user usage habits.
Key influencing factors:
Mail server software and configuration: Common mail server software include Postfix (fast, reliable, lightweight), Exim (highly customizable) and Dovecot (popular IMAP/POP3 server). Their configuration options (such as mail queue size, connection limit, etc.) directly affect server performance.
Hardware and network environment: The server's CPU, memory, storage space, network bandwidth, as well as the stability and speed of network connections will limit the server's processing capabilities.
Server configuration: A reasonable mail server configuration is crucial. For example, Postfix and Dovecot configuration files have many parameters that can be adjusted to optimize performance.
User usage habits: The frequency of sending and receiving emails, size of emails, and the email client software used will affect the server load. High traffic and large attachment emails will significantly increase server pressure.
To accurately evaluate the maximum user bearer of the Debian mail server, performance testing and tuning is required based on the actual hardware and network environment. There is no simple formula that gives exact numbers.
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