Edit Class of Service - SMTP Incoming

Use this dialog box to determine whether or not members of the class of service can receive Internet mail messages.

Inherit Access
Select this option if you want members of this class of service to inherit their access from a class of service assigned at a higher level. For example, a post office inherits the domain's access. If the domain is not a member of a class of service, the post office inherits the default class of service.

Allow Incoming Messages
Select this option to allow members of the class of service to receive e-mail messages over the Internet. You can use the Exceptions option to prevent messages from specific Internet sites.

Prevent Incoming Messages
Select this option to prevent e-mail messages coming from the Internet. You can use the Exceptions option to allow messages from specific Internet sites.

Prevent Messages Larger Than
This option is available only if you chose Allow Incoming Messages or Prevent Incoming Messages. In the case of Prevent Incoming Messages, this option only applies to messages received from Internet sites listed in the Allow Message From list.

If you want to set a size limit on incoming messages, select the limit.

Exceptions
This option is available only if you chose Allow Incoming Messages or Prevent Incoming Messages.

If you've chosen to allow incoming messages but you want to prevent messages from specific Internet sites (IP addresses or DNS hostnames), add the sites to the Prevent Messages From list.

Conversely, if you've chosen to prevent incoming messages but you want to allow messages from specific Internet sites (IP addresses or DNS hostnames), add the sites to the Allow Messages From list.

You can also use the Allow Message From list to override blacklists (Access Control tab > Blacklists page). For example, if goodhost.com has been added to a blacklist but you still want to receive messages from that host, you could add the host to the Allow Messages From list.