Mail server configuration is a very important aspect of many Linux systems' configurations. This setup begins with the mail server configuration in your network's DNS server, which normally points callers to your network's mail server computer. The various default Linux mail servers, sendmail, Postfix, and Exim, have their own specific configuration details, but the basic configuration tasks are the same for each. You must configure these servers to insert the appropriate hostnames in outgoing mail, accept incoming mail addressed to your domain, and relay the mail they should relay but not relay the mail they shouldn't relay. Part of this relay configuration is intended to prevent your system from becoming a source of spam, and you may want to use any of several programs to block incoming spam, as well. Many networks require their own pull mail servers, which enable users to read mail using programs on their desktop computers. Naturally, Linux provides several options for pull mail servers. Finally, if you need to retrieve mail from external pull mail servers for delivery in your own mail server's mail queue, you can use a program called Fetchmail to serve as a bridge.

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