Mail user agent (MUA): this component that the user sees and interacts with like Thunderbird and Microsoft Outlook, these user agents are responsible for reading mail and allowing you to compose mail. The mail service on any mail server has three components: The Postfix took mail server implementation one step further they developed it with security in mind. Sendmail is a famous and free mail server, but it has a little complex design and less secure. Most Linux distros today come with two of the most common implementations of SMTP, which are sendmail and Postfix. SMTP requires only that a server can send straight ASCII text to another server, you can do this by connecting to the server on port 25, which is the standard SMTP port. SMTP defines how to send mail from one host to another it is also system independent, which means the sender and receiver can have different operating systems. Secure mailboxes from spam using SpamAssassin.
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