1. Sub-virtual email address and host mapping. For virtual server accounts with multiple domains this will allow each domain to share common email user names. For example, if xyz.com and abc.com are hosted on the same virtual server, both domains can have mail to "webmaster" go to seperate mail boxes. Mail to "webmaster@xyz.com", for example, can be mapped or routed to "user1" (a local pop account) and mail to "webmaster@abc.com" could be routed to "ruser@isp.com" ( a remote mail account on an access ISP's server). The feature also supports a "wild card" mapping in which mail to any user name for a domain name can be mapped to an user. This can be "catch all" or in conjunction with other mappings to route "User Unknown" mail to an autoreply or an account acting as a postmaster for the virtual sub-hosted domain.

2. Anti-SPAM or mail blocking support. This feature allows you to specify individual mail addresses or whole hostnames that you do not want mail from. If someone is sending you and your users mail you don't can for you can reject all email from that someone. You can also block all mail from any user by just specifying the hostname. (For more information about SPAM see http://www.vix.com/spam/ "Promote Responsible Internet Commerce: Fight SPAM")

NOTE: After January 21, 1997 all new accounts by default have the modifications for sendmail.cf already installed. Therefore, if your account was installed adding after this date skip step (1). To take advantage of these features you must update your sendmail.cf file and edit a couple of files:

(1) Run "updatesendmailcf":

	% updatesendmailcf

This will update your ~/etc/sendmail.cf file and add two new files:
~/etc/spammers and ~/etc/virtmaps.

(2) Edit ~/etc/spammers and add a list of email addresses and/or
hostnames you don't want email from.  Each entry needs to be on its
own line.  For example, if I want mail from "spammer@aol.com" and from
anyone at "cyberpromo.com".  I would add the following to my ~/etc/spammers
file using my favorite UNIX editor:

spammer@aol.com
cyberpromo.com

NOTE: Lines that start with "#" characters are comments.  Comments are good.

(3) After *everytime* you edit ~/etc/spammers, run "vnewspammers" from the
UNIX command prompt:

	% vnewspammers

Note: The "vnewspammers" command will create the ~/etc/spammers.db
database file.

(4) Edit ~/etc/virtmaps and add email address mappings.  The left hand
side is the email address that mail is *sent* to and the right hand
side is the email address mail is *delivered* to.  If the left hand
side just contains a domain name then all mail to that domain name
will be delivered to the email address on the right hand side.  In
other words, you can have either "email address -> email address" or
"domain name -> email address" mappings in this file.  It is a good
idea to put all "domain name -> email address" mappings at the bottom of
the file so that it tries the "email address -> email address" mappings
first.  Note that the first mapping that matches is used first.

For example, assume I have the domains xyz.com and 123.com virtually
sub-hosted on my virtual server.  Both owners of these domains want
mail to "webmaster" for their domain name to come to them.  The owner
of xyz.com has a mail box hosted on my virtual server and his user
name is "biff".  The owner of 123.com prefers to read his mail from
his local ISP and his email address there is "bud@isp.net".  Also, the
owner of xyz.com would like mail not address to "webmaster@xyz.com"
(any other username but "webmaster" sent to this domain) sent to his
secretary who also has a mail box hosted on my virtual server.  The
user name for his secretary is "sue".  To impliment this I would add
the following to my ~/etc/virtmaps using my favorite UNIX editor:

webmaster@xyz.com		biff
webmaster@123.com		bud@isp.com
xyz.com				sue

(5) After *everytime* you edit ~/etc/virtmaps, run "vnewvirtmaps" from
the UNIX command prompt:

	% vnewvirtmaps

Note: The "vnewvirtmaps" command will create the ~/etc/vertmaps.db
database file.

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