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Old 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

testmxlookup

TESTMXLOOKUP(1) 					      Double Precision, Inc.						   TESTMXLOOKUP(1)

NAME

       testmxlookup - Look up mail relays for a domain

SYNOPSIS

       testmxlookup [@ip-address] [--dnssec] [--udpsize n] {domain}

DESCRIPTION

       testmxlookup lists the names and IP addresses of mail relays that receive mail for the domain. This is useful in diagnosing mail delivery
       problems.

       testmxlookup sends a DNS MX query for the specified domain, followed by A/AAAA queries, if needed.  testmxlookup lists the hostname and the
       IP address of every mail relay, and its MX priority.

   DIAGNOSTICS
       The error message "Hard error" indicates that the domain does not exist, or does not have any mail relays. The error message "Soft error"
       indicates a temporary error condition (usually a network failure of some sorts, or the local DNS server is down).

   OPTIONS
       @ip-address
	   Specify the DNS server's IP address, where to send the DNS query to, overriding the default DNS server addresses read from
	   /etc/resolv.conf.

	   "ip-address" must be a literal, numeric, IP address.

       --dnssec
	   Enable the DNSSEC extension. If the DNS server has DNSSEC enabled, and the specified domain's DNS records are signed, the list of IP
	   addresses is suffixed by "(DNSSEC)", indicating a signed response.

	   This is a diagnostic option. Older DNS servers may respond with an error, to a DNSSEC query.

       --udpsize n
	   Specify that n is the largest UDP packet size that the DNS server may send. This option is only valid together with "--dnssec". If
	   "--dnssec" always returns an error, try "--udpsize 512" (the default setting is 1280 bytes, which is adequate for Ethernet, but other
	   kinds of networks may impose lower limits).

SEE ALSO

       courier(8)[1], RFC 1035[2].

AUTHOR

       Sam Varshavchik
	   Author

NOTES

	1. courier(8)
	   [set $man.base.url.for.relative.links]/courier.html

	2. RFC 1035
	   http://www.rfc-editor.org/rfc/rfc1035.txt

Courier Mail Server						    11/18/2011							   TESTMXLOOKUP(1)