10-25-2000
<P>Current email architectures follow an n-tier construct where the presentation logic is decoupled from the application logic and the datastores. This means that your system (if the company is big) should have datastores where email is stored/archived that are completely independent of the mail routing and filtering application logic.<P>
The mail routing and filtering application logic should be decoupled from the user mail client. This means that you could use any kind of client, from a web browser, Outlook, POP/IMAP clients, wireless phones, etc. to access mail.<P>
The application logic helps you route mail in a complex orgainzation, filter mail, etc. This may be tied to a directory service (i.e LDAP) or other directory system.
<P> Take a look at
http://www.n-tier.com to understand n-tier architecture and then apply the idea to your mail analysis. If you do this, you will be moving your organization into the future, not taking them backwards into older 2-tier client server models (and certainly not back to older monolithic/vertical email applications).
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LEARN ABOUT DEBIAN
courierldapaliasd
COURIERLDAPALIASD(8) Double Precision, Inc. COURIERLDAPALIASD(8)
NAME
courierldapaliasd - LDAP-based mail aliasing
SYNOPSIS
courierldapaliasd {start}
courierldapaliasd {stop}
courierldapaliasd {restart}
courierldapaliasd {query} {source} {address}
DESCRIPTION
courierldapaliasd supports mail address aliasing, as implemented by makealiases(8)[1] but using an LDAP directory instead of a GDBM or a DB
database. The term "aliasing" refers to substituting one or more addresses for another address. A one-to-one substitution results in the
Courier mail server accepting mail for one address, and delivering the mail to another address. A one-to-many substitution results in the
Courier mail server accepting mail for one address, and delivering a separate copy of the message to every address defined by the alias.
makealiases(8)[1] uses a GDBM or a DB database to perform the aliasing function. courierldapaliasd uses an LDAP directory instead.
"courierldapaliasd start" runs the courierldapaliasd process in the background, and should be executed at system startup.
"courierldapaliasd stop" stops the background process. "courierldapaliasd restart" restarts the process, and rereads the ldapaliasrc
configuration file to pick up any changes. courierldapaliasd restart must be executed in order for any changes to ldapaliasrc to take
place.
courierldapaliasd runs in the background and opens a persistent connection to the LDAP directory, and checks every recipient address using
the persistent connection. courierldapaliasd automatically starts an adjustable number of multiple processes. With persistent connections
being used, this allows alias checking to be as efficient and quick as possible.
"courierldapaliasd query source address" is a diagnostic tool. It requires that courierldapaliasd must already be running in the
background; it sends a query for address to the background process, and prints the result. Like makealiases(8)[1], it is possible to create
aliases that are accessible only to certain sources of mail, like "esmtp" or "local". The "source" argument specifies the source of the
address, such as "local", "esmtp", or "uucp".
CONFIGURATION
courierldapaliasd requires OpenLDAP client libraries, and is installed automatically if OpenLDAP client libraries are available at
installation time. The default ldapaliasrc configuration file contains additional instructions for configuring LDAP-based aliasing.
FILES
/usr/sbin/courierldapaliasd
/etc/courier/ldapaliasrc
SEE ALSO
dot-courier(5)[2], courier(8)[3], makealiases(8)[1], makeuserdb(8)[4].
AUTHOR
Sam Varshavchik
Author
NOTES
1.
makealiases(8)
[set $man.base.url.for.relative.links]/makealiases.html
2.
dot-courier(5)
[set $man.base.url.for.relative.links]/dot-courier.html
3.
courier(8)
[set $man.base.url.for.relative.links]/courier.html
4.
makeuserdb(8)
[set $man.base.url.for.relative.links]/makeuserdb.html
Courier Mail Server 08/30/2011 COURIERLDAPALIASD(8)