Mail received by your MTA is delivered to a queue directory on your server. Recipients are expected to pick up messages from here and store them in their own mailboxes. If users connect to your server by SSH, they may use terminal applications such as
alpine and store messages in their home directories. Another access method you can provide is a web mail application such as Roundcube, which runs on Apache with PHP. Webmin's companion product, Usermin, also provides basic mail functionality for users. See the Installing Usermin recipe in Chapter 2, User Management, for more information.
You can find more information on each of these programs online, but most system distributions offer convenient ...