Download Linux Email by Alistair McDonald, Ian Haycox, Magnus Bäck, Carl Taylor, PDF

By Alistair McDonald, Ian Haycox, Magnus Bäck, Carl Taylor, David Rusenko, Patrick Ben Koetter, Ralf Hilderbrandt

This booklet grants simply what you must comprehend to establish and retain an e mail server. in contrast to different methods that take care of one part at a time, this publication gives you a step- by-step method throughout the entire server parts, leaving you with an entire operating e mail server in your small company community.

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Extra resources for Linux Email

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Two very important Postfix parameters, mynetworks and mynetworks_style, control which hosts are allowed to use your server as a relay. Setting these incorrectly may allow your server to be abused by spammers and the likes, so it is important that you get them right. By default, all hosts on the subnets that your server is directly connected to will be allowed access. This should be secure in most cases. These parameters and other methods of allowing relay access will be discussed in depth in Chapter 5.

If you have multiple network interfaces and you do not want Postfix to use all of them, you can adjust this parameter to list the addresses or hostnames of the interfaces you do want Postfix to use. Some Linux distributions set inet_interfaces to localhost by default, which means that Postfix will listen only on the loopback interface. This makes at least some sense for workstations, but it is obviously completely unusable for servers that need to receive messages from foreign hosts. cf to disable it.

38 ] Chapter 2 Parameter delay_warning_time Description By default, Postfix does not send a warning if a message cannot be delivered for some time. Setting this parameter to a particular duration, say 5h for five hours, will cause Postfix to send a single warning message for each message that has been undeliverable for that period of time. A word of caution, though: Your users may not be able to interpret this warning message correctly. Even though Postfix clearly states that it is only a warning and that the message does not need to be resent, many users do not understand this and resend their delayed message anyway.

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