Configuring Your Exchange Server For Mail-On-Demand
	To implement Microsoft Exchange Mail-On-Demand, you will need to configure your Exchange Server to dial-up to the local ISP on demand. How to do this should be documented in your Exchange Server manuals. A great additional resource is provided by Simpler-Webb. In essence you need to: Configure your RAS/DUN You will need an entry in the phonebook that makes an automatic connection to your local ISP at the intervals you specify. You need a TCPIP hostname and domain configured in Control Panel/Networks/TCPIP Configure the Exchange SMTP service For Exchange Server 5.0 this will be the Internet Mail Service. This should be pointed to the SMTP server for your Virtual Server (smtp.yourdomain.name). If necessary, configure the SMTP Addresses for your users You can globally configure this using the Site Addressing configuration page, or you can use Directory Import to configure individual addresses. This would only be necessary in the event you had multiple users in your "Intranet" that had a different VPS. Configure the server to tell the mail server to dequeue mail You will need to configure your Exchange Server to run the "etrn" command. This command tells the VPS to attempt to resend your queued mail. The dequeue.exe program, written by Simpler Web Inc., will help set up your Exchange Server to do this. In essence, you're connecting to your SMTP port and telling the mail server you want to dequeue your mail. For those people not using Exchange Server, you could write your own script. Here is an example Unix shell script that would do the same (substitute your domain name for my-domain.com). #!/bin/sh # I got this from: # http://www.swinc.com/resource/exch_smtp.htm # Send ETRN command to sendmail 8.8.x # written by Andy Rabagliati <andyr@wizzy.com> # telnet mail.my-domain.com smtp <<SMTP_EOF ETRN my-domain.com QUIT SMTP_EOF # # End of Shell script # Or alternately #!/bin/sh OURSITE=exchange.isp.com MAILSERVER=mail.sfpsi.com TELNET=/usr/bin/telnet PORT=25 echo "etrn " | exit 0
	ISP Configuration
	You must have a dedicated IP address for the Exchange Server dial-up solution to work. There is no other alternative to this (currently). You must do one of the following. Purchase a dedicated modem at your ISP's modem bank that only you connect to and that is assigned your dedicated IP address Your ISP has the ability to detect when you dial in and can assign that dial-in your dedicated IP number. The second thing your ISP must do for you is map a domain name to that dedicated IP address. For example, if your local Internet Service Provider has a domain name "my-isp. com" and they were going to give you an IP address of 222.222.222.222, you want them to map 222.222.222.222 to a unique instance of my-isp.com. As an example: exchange.myisp.com mapped to 222.222.222.222 Here is an example DNS entry for this: @ IN SOA ns1.my-isp.com. hostmaster.my-isp.com. ( 1997072802 ; Serial number 86400 ; Refresh 7200 ; Retry 2592000 ; Expire 172800 ) ; Minimum TTL NS NS1.MY-ISP.COM. NS NS2.MY-ISP.COM. A 222.222.222.1 MX 10 my-isp.com exchange A 222.222.222.222 Another alternative would be to use your VPS domain name in the zone file above instead of the name "exchange". For example if I had a VPS and my domain name for the VPS was mycompany.com I might have my ISP set up their DNS zone to point to mycompany A 222.222.222.222 Now, all mail sent to mycompany.my-isp.com would resolve to the dedicated IP address 222.222.222.222 This is important, you must have a dedicated IP address (one that is uniquely assigned to your Exchange Server), and you must have a domain name pointing to that IP address for the Mail-On-Demand solution to work.
	Virtual Server Configuration
	Finally, you must Configure Your VPS for Mail-On-Demand.