The 20 Minute E-mail Solution!
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Setting Access to the SMTP Server

You can specify an IP address or set of IP addresses that are either granted access to the SMTP server or denied access. Systems that do not have access to the SMTP server system will not be allowed to connect. This is useful when you know the IP address(es) of a mail sender that is unauthorized to use your mail server.

Note that, in most cases, you would not use this option to specify the addresses that you want to grant access, because you don't know every host on the Internet that wants to send mail to your users.

To deny access to a specific computer or group of computers:

  1. In IMail Administrator, select localhost in the left panel.
  2. Expand the Services folder and select SMTP. The SMTP tab appears in the right panel.
  3. Click the SMTP Security tab. The SMTP Security properties appear.
  4. Click Control access. The Access Control dialog box appears.

  1. Select Granted Access.
  2. Click Add. The Deny Access On dialog box appears.
  3. In the IP Address box, enter the IP address of the computer to be denied access to the SMTP server.
To deny access to a group of computers, select Group of Computers. In the IP Address and Subnet Mask boxes, enter the IP address and subnet mask for the group to be denied. For example, if you have a class C address space of 156.21.50.0, enter a group address of 156.21.50.0 and a subnet mask of 255.255.255.0. This denies access to those 254 systems.
  1. Click OK to add the IP address(es) to the list.
Access will be granted to all computers except those listed.
  1. Click OK to save the changes. Note that you must stop and restart the service for the changes to take affect.
To grant access to a specific computer or group of computers:
  1. Click Control access. The Access Control dialog box appears.
  2. Select Denied Access.
  3. Click Add. The Grant Access On dialog box appears.
  4. In the IP Address box, enter the IP address of the computer to be granted access to the SMTP server.
To grant access to a group of computers, select the Group of Computers option. In the IP Address and Subnet Mask boxes, enter the IP address and subnet mask for the group. For example, if you have a class C address space of 156.21.50.0, enter a group address of 156.21.50.0 and a subnet mask of 255.255.255.0. This grants access to those 254 systems.
  1. Click OK to add the IP address(es) to the list. Access is denied to all computers except those listed.
  2. Click OK to save the changes. Note that you must stop and restart the service for the changes to take effect.

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