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Linux Server Security, Second Edition
book

Linux Server Security, Second Edition

by Michael D. Bauer
January 2005
Intermediate to advanced content levelIntermediate to advanced
544 pages
23h 44m
English
O'Reilly Media, Inc.
Content preview from Linux Server Security, Second Edition
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
Postfix
|
291
After configuring the chroot jail and editing master.cf, all you need to do is start Post-
fix the way you normally would:
postfix start.
Postx Aliases, Revealed
You probably don’t want your users connecting to and storing mail on a publicly
accessible server. The greater the separation between public servers and private serv-
ers, the better. (Don’t forget, POP3 passwords are transmitted in cleartext by default.)
Therefore, your SMTP relay should be configured to forward incoming mail to some
other server or servers on your internal network.
As alluded to in the quick-and-dirty procedure, aliases are useful for mapping email
addresses for users who don’t actually have accounts on the SMTP gateway. This
practice has two main benefits: first, most users tend to prefer meaningful email
names and short host-domain names—e.g., john.smith@acme.com rather than
jsmith023@mail77.midwest.acme.com.
Still another use of aliases is the maintenance of mailing lists. If an alias points to a
comma-separated list of addresses rather than a single address, mail sent to that alias
will be copied and sent to all specified addresses—i.e., to the mailing list.
The addresses that a mailing list comprises can also be stored in a separate file (each
address on its own line). To specify an entry
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Publisher Resources

ISBN: 0596006705Supplemental ContentCatalog PageErrata