Set Relay Restrictions on a Virtual Server
Exchange blocks computers from relaying unwanted e-mail through an SMTP virtual server. By default, all users and computers are blocked from relaying, except those that are able to authenticate.
Tip If your virtual server is on the Internet, you should disable relaying in order to prevent your server from being used to propagate unsolicited commercial e-mail.
To remove relay restrictions from a virtual server:
You can specify the following options in Relay Restrictions:
|Only the list below||Only the computers listed below can relay messages through the SMTP virtual server.|
|All except the list below||All computers can relay messages through the SMTP virtual server, except those listed below. This is set by default, along with Allow any computers which successfully authenticate to relay, regardless of the list above.|
|Add and Remove||Adds and removes entries to the list of those computers either granted or denied relay access.|
|Allow all computers which successfully authenticate to relay, regardless of the list above||Allows computers that meet authentication requirements set in the Authentication dialog box to relay messages to the SMTP virtual server. This is set by default.|