Ubuntu Unleashed 2019 Edition: Covering 18.04, 18.10, 19.04

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customize the service. Having the process handled by different applications
gives you great control over how you provide email service to users on your
network, as well as to individual and small office/home office (SOHO) users.


For example, you could do the following:


    Use Evolution   to  read    and compose mail.
Use Sendmail to send your mail.
Use xbiff to notify you when you have new mail.
Use Fetchmail to retrieve your mail from a remote mail server.
Use Procmail to automatically sort your incoming mail based on sender,
subject, or many other variables.
Use Spamassassin to eliminate the unwanted messages before you read
them.

Basic Postfix Configuration and Operation


Because Postfix is the Ubuntu-recommended MTA, the following sections
provide a brief explanation and examples for configuring and operating your
email system. As mentioned earlier, however, Postfix is an extremely
complex program with many configuration options. Therefore, this chapter
covers only some of the basics.


Postfix is not installed by default. To use it, install the postfix package
from the Ubuntu software repositories. During installation, you are asked a
series of questions to begin configuring Postfix immediately. Research the
settings for your situation before you start; some are merely preferential, but
others are based on your hardware, network, and use case. You are asked the
following:


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General type    of  mail    configuration:  Internet    Site

System  mail    name:   mail.matthewhelmke.com
Root and postmaster mail recipient: <admin_user_name>
Other destinations for mail: mail.example.com, example.com,
localhost.example.com,
localhost
Force synchronous updates on mail queue?: No
Local networks: 127.0.0.0/8

Mailbox size    limit   (bytes):    0
Local address extension character: +
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