Forgot the link!!
by
mford66215
·
about 16 years, 11 months ago
In reply to not easily read, that’s true
http://support.microsoft.com/kb/823019/en-us
To Configure IP Address Restrictions
To configure IP address restrictions: 1. Click Start, point to Programs, point to Microsoft Exchange, and then click System Manager.
2. Expand Administrative Groups (if appropriate), expand AdministrativeGroup (if appropriate), expand Servers, expand ServerName, and then expand Protocols.
3. Expand SMTP, right-click Default SMTP Virtual Server, and then click Properties.
4. Click the Access tab, and then click Connection.
5. In the Connection dialog box, click Only the list below.
This indicates that only the IP addresses and the domains that are in the list are permitted to connect to the SMTP virtual server.
6. Click Add, and then do one of the following to add a single computer, a group of computers, or a domain, as appropriate to your situation: ? To add a single computer, click Single Computer, type the IP address of the e-mail messaging server of your Internet service provider (ISP) in the IP address box, and then click OK.
Alternatively, click DNS Lookup, type a host name, and then click OK.
? To add a group of computers, click Group of computers, type the subnet address and the subnet mask of the group in the corresponding boxes, and then click OK.
Microsoft recommends this option if your ISP has a tendency to change the IP address of their e-mail messaging server without warning.
? To add a domain, click Domain, type the domain name that you want in the Name box, and then click OK.
Note that this option requires a DNS reverse lookup on each incoming connection. This requirement may adversely affect the performance of the Exchange server. For more information, see the Troubleshoot section later in this article.