Direct Mail Strategies
Dial-up anti-spam configurations The Dial-up User List (DUL) is a list of IP addresses associated with dial-up (typically PPP) connections. (See http www.mail-abuse.org dul for more information on the DUL.) Many mail servers use the DUL, or similar lists maintained by others, to block mail from these connections, because spammers sometimes abuse dial-up lines to send spam. If your ISP has placed your dial-up number on the DUL, some recipients will reject your direct mail on this basis. Relaying your mail through the ISP's official server will work around this problem the DUL affects only e-mail that's sent directly from a listed address.
This output shows us how sendmail processes mail addressed to isaac on this system. Each line shows us what information has been supplied to a ruleset or the result obtained from processing by a ruleset. We told sendmail we wished to use rulesets 3 and 0 to process the address. Ruleset 0 is what is normally invoked and we forced ruleset 3 because it is not tested by default. The last line shows us that the result of ruleset 0 does indeed direct mail to isaac to the local mailer.
The BTS sets the Reply-To header on the bug report forward to the submitter's address as well as the bug address. Thus, when the maintainer replies, thesubmitter receives a direct mail, and the BTS files the reply. Then, the BTS forwards the reply back to the maintainer as well as the debian-bugs-dist mailing list.
Masquerading would establish a single domain name for all the users on your network, regardless of their hosts. Mail could be sent to just the mail hub and users would access their mail through a POP server. An MX record would direct mail for the masquerade domain to the mail hub.
Postfix has two commonly used methods for solving this problem. The first is the native Postfix method, using a virtual table to direct mail to the correct destination. The second method is modeled after the way Sendmail handles the problem, and is therefore a lot more complex. Because simplicity is better than complexity, you'll learn the native Postfix mechanism exclusively. The Postfix virtual man page covers both methods in moderate detail. If you have an older Sendmail installation that is being converted to Postfix you may wish to use the second method and maintain your current virtual mail configuration. If you will be running an extremely large number of virtual domains, it is likely preferable to use the second method, as well.
Mail aliases provide a means to redirect mail to local recipients. Specifically, it allows mail destined for a number of different addresses to be delivered to a single mailbox. A common use for this is to direct mail for users like postmaster to a real person. This page is divided into two sections. The upper section labeled Aliases Options contains the location and format of the alias files that Postfix should use to construct its alias databases and specifies the type of database to use. The lower section provides a list of all configured aliases on the system, and what the alias maps to.
Here you define what Sendmail does when it receives a message for this aliased address. There are several options for this, and they are selected from the drop down list. Email address is simply another email address to deliver the mail to. Addresses in a file causes the mail to be sent to every address named in the file provided in the text entry field--this allows you to more easily allow users to create their own aliases without giving them access to the etc aliases file. Write to file will cause Sendmail to write every mail sent to the address to a file chosen in the text entry field. Feed to program is interesting, in that it allows you to direct mail to any program on your system, thus you could write a script or a program (or find one already written) to provide any number of services based on the email received. Or it could file your mail in a database, or customer service system, or any number of other useful things. Finally, Autoreply from file simply sends a mail...
Specify nicknames for individual users Nicknames can be used to direct mail addressed to special names, such as postmaster or root, to the real users that do those jobs. When used in conjunction with the domain MX records covered in Chapter 4, Linux Name Services, aliases can be used to create a standard e-mail address structure for a domain. The last eight lines are user aliases we added to the file. These lines direct mail received at the mail server to the computers where the users read their mail. These aliases can be in a variety of formats to handle the various ways that e-mail is addressed to a user. The first three lines that forward mail to norm hawk.foobirds.org all illustrate this. Assume that this etc aliases file is on wren, and that the MX record in DNS says that wren is the mail exchanger for foobirds.org. Then, mail addressed to norman.edwards foobirds.org would actually be delivered to norm hawk.foobirds.org. It is the combination of mail aliases and MX records that...
Direct Mail Secrets Exposed
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