---

---

Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 257 This m4 macro enables the use of “always_add_domain” (add the local domain even on local mail). With this feature all addresses that are locally delivered will be fully qualified. It is safe and recommended to set this feature. FEATURE(use_cw_file) This m4 macro enables the use of “use_cw_file” (use /etc/sendmail.cw file for local hostnames). With this feature you can declare a list of hosts in the “/etc/sendmail.cw” file for which the local host is acting as the MX recipient. In other word this feature causes the file “/etc/sendmail.cw” to be read to obtain alternative names for the local host. FEATURE(local_procmail) This m4 macro enables the use of “local_procmail” (use procmail as local delivery agent). With this feature you can use procmail as a Sendmail delivery agent. Remember, it is recommended to have procmail program installed in your Central Mail Hub server. FEATURE(nouucp) This m4 macro enables the use of “nouucp” (eliminate all UUCP support). With this feature the macros of Sendmail that relate to UUCP service are ignored. In other word if you don’t support uucp service in your mail server, you can disable all uucp support in your Sendmail configuration with this macro. MAILER(procmail) and MAILER(smtp) This m4 macro enables the use of “procmail” and “smtp” as delivery agents (in Sendmail by default, delivery agents are not automatically declared). With this feature, you can specify which ones you want to support and which ones to ignore. The MAILER(procmail) and MAILER(smtp) options causes support for procmail, smtp, esmtp, smtp8 and relay delivery agents to be included. FEATURE(`access_db') This m4 macro enable the access database feature. With this feature you have the ability through the access db to allow or refuse to accept mail from specified domains. Usually this feature must be available only in a Central Mail Hub server. FEATURE(`blacklist_recipients') This m4 macro enable the ability to block incoming mail for certain recipient usernames, hostnames, or addresses. With this feature you can, for example, block incoming mail to user nobody, host foo.mydomain.com, or guest@bar.mydomain.com. FEATURE(`rbl') This m4 macro enable Sendmail to reject mail from any site in the Realtime Blackhole List database "rbl.maps.vix.com". The RBL is a database maintained in DNS of spammers. For details, see "http://maps.vix.com/rbl/". NOTE: Sometimes, a domain with which you wish to continue communications may end up in the RBL list. In this case, Sendmail allows you to override these domains to allow their e-mail to be received. To do this, simply edit the "/etc/mail/access" file and add the appropriate domain information. For example: blacklisted.domain      OK Step 2 Now that our macro configuration file “sendmail.mc” is create, we can build the sendmail configuration file “sendmail.cf” from these statements with the following commands: