Linux Administration Stopping Spam with Linux Tutorial

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Tutorial: Linux Administration Stopping Spam with Linux Tutorial

Spam is a topic that will get most sys admins to start pulling out their hair whenever it's mentioned. This deluge of white noise floods e-mail inboxes every day. But is there a way to turn down the volume on some of this noise? In this Admin Digest, Rob

Tutorial Details:

Linux Administration Stopping Spam

If you have used email at all you have seen spam: unsolicited and unwanted email. The way that email works means that it is very easy to send out bulk mailings at a very low cost. The cost is low because largely it is the receiver of the email that pays. If you read email on a dialup modem line or pay for your Internet connection, then in a real sense you are paying for the spam you get.

Often it is difficult for ISPs to block spam to everyone. This is because the ISPs do not know which email items you want to receive and which ones you do not. The ISP cannot predict in advance what email you have an expectation of getting and from where. It would also be inappropriate for ISPs to screen the content of the messages. There would also be privacy issues. However, there are certain approaches that can be taken at the email server side. If you have recently installed Linux and are thinking of running your own email server, then you should carefully consider the problem of spam.

Focus on sendmail
Sendmail is the most widely used MTA (Mail Transport Agent) on the Internet.

It's an old, large, complex and not particularly efficient program. In particular it has a bad reputation for being difficult to configure. Whatever email server program you choose to use, though, blocking spam is still an important issue. The concepts outlined below are applicable to any type of server program. If you already run sendmail, I would recommend upgrading to the latest version. That way you can take advantage of any security patches or new features.

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