In the first (Professional web hosting) line, because the fictional ACSP
In the first line, because the fictional ACSP program is no longer used on the machine, there s no need to track its errors, so the mail is effectively ignored. The second line stores incoming trouble tickets in the /var/spool/trouble/incoming file. Remember that if you enable this, anyone anywhere can send you a sufficiently large message to fill up the partition on which that directory resides. This is a security risk and should be carefully evaluated before being implemented. Incoming messages can be piped directly into an executable program: majordomo: “| /usr/lib/majordomo/wrapper majordomo” Tip When resolving addresses, sendmail doesn t actually use the /etc/aliases text file. For faster accesses, the text file is turned into a Berkeley database-format file, /etc/aliases.db, which is used to resolve aliased addresses. For this reason, the newaliases command (equivalent to sendmail -bi) must be run to rebuild the database file each time the /etc/aliases text file is modified. Administering a Mailing List Even though sendmail provides several flexible methods for aliasing addresses, many situations require additional functionality. Mailing list managers (or, more commonly, listservers) offer the ability to handle large distribution lists coupled with advanced features such as moderators, archives with file transfer, digests, automatic subscription, and automatic filtering of bad addresses. Listservers typically provide several options for how each list is configured (replies go to author, replies go to the list, anyone can post to the list, posts are restricted to subscribers, subscriptions are open to anyone, subscriptions must be confirmed, and so forth). They also provide options for how the messages are presented to the recipients (with custom headers and footers, subject prefixes, filtered text in the header or body, and so forth). This section briefly describes the majordomo mailing list manager. Majordomo is a free listserver written in Perl, with the exception of one wrapper program (which is not written in Perl) that allows switching to the majordomo user. The configuration files (for the listserver as well as each individual list) are in plain text and are simple to edit. Other available mailing list managers are listed in the accompanying sidebar. Other Mailing List Managers Although the basic concept of a listserver is common to all mailing list managers, some packages offer radically different features and approach the task in a different manner. The following are some of the other listservers that are available for Linux: CREN ListProc 9.0 Available for a $2,000 donation to CREN (Corporation for Research and Educational Networking), this mailing list manager features Web-based administration, extensive logging capabilities, and automatic deletion of bad addresses. Further information and a free trial version can be found at www.cren.net/listproc/. listar This free mailing list manager (created originally for Linux) features nonprivileged execution, secure remote administration via e-mail, and expandability through dynamically loaded modules. More details and source code are available from www.listar.org/. L-Soft LISTSERV In use for more than a dozen years (originally on IBM mainframe computers), this package features file transfer via e-mail, indexing, digests, and subscription flags. Details,
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