SUMMARY

How to use MailEnable to check for viruses and perform Realtime Blackhole List (RBL) lookups in a Microsoft Exchange environment.

DETAIL

The required configuration changes follow:

Exchange (2000) modifications
1. Open the System Manager (Start Programs|Microsoft Exchange|System
Manager)
2. Browse to Servers| Server |Protocol|SMTP|Default SMTP Virtual Server and select Properties
3. Under the General tab, select the Advanced button and change the ports to something other than 25

These steps are optional (and are only required to perform virus scanning through MailEnable for outbound messages):

4. Under the Delivery Tab, select Advanced
5. In the Smart Host text box, enter the IP address/node name that will all access to the MailEnable server.

(This will allow outgoing messages from Exchange to be checked for viruses via MailEnable. Note: It is important to grant relay rights under MailEnable for the IP Address of the Exchange server - otherwise MailEnable will refuse to dispatch the messages on behalf of Exchange).

MailEnable configuration
1. If a post office has not been defined under MailEnable, create one. In this case we will assume that the post office is called EXCHANGE
2. Create all the registered domains under the EXCHANGE post office
3. Configure each of these domains to be smart hosted to the IP or node name of the server. Suffix each IP/node name with the port number that the Exchange SMTP service is running on.
e.g. 192.168.19.2:26

Using this configuration, MailEnable will receive mail (as defined by DNS MX records for the desired domains). It will then detect the target domains of the messages and relay them to Exchange for delivery.

Additional Considerations:
MailEnable will not use the smarthosting rule if either of the following is true:

1. A catch-all has been defined for the domain that is being smarthosted
2. Address maps (E-Mail addresses) for the domain being smarthosted are assigned to the mailboxes for the domain.

Hence, MailEnable will satisfy local delivery requirements before the smarthosting rule is applied.
Also, MailEnable's SMTP Connector knows when a domain is smarthosted and will accept e-mail for any address for that domain. If smarthosting is disabled this will produce a 550 error (because unless the domain is smarthosted, or a catchall is defined or an the target address has been assigned to a MailEnable mailbox).

MORE INFORMATION

Which antivirus solutions can be used with MailEnable?: http://www.mailenable.com/kb/content/article.asp?ID=ME020144

How does antivirus filtering work how to configure it: http://www.mailenable.com/kb/content/article.asp?ID=ME020056