PostCast SMTP Server
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Reject mail if sender has no MX record

When the client receives messages, the program will first check whether the sender's e-mail address has an MX record on the DNS server. This means that it will try to find out whether there is an e-mail server on the Internet which downloads messages for that e-mail address.

This option can be useful in case PostCast Server is open for multiple users and you want to deny access to the user who has intentionally or by chance entered an invalid (nonexistent) e-mail address that identifies him/her. This is often the case when somebody is sending Spam and is thus trying to hide their identity.

Be careful with this option. In many cases, MX data for e-mail addresses cannot be found on the DNS server. If so, you will prevent a user with a valid e-mail address from accessing the server, which is not the purpose of this option.

Allow access ONLY for users with these IP addresses

The program will allow access only to those users from the Internet or LAN whose IP addresses have been entered. To add an IP address to the list, click on the "Add" button. In case there are no IP addresses on the list, the program will be available to all users depending on how the "Host Name" option has been set.

You can specify an IP range in the security section of the program. For example, '192.168' value will allow access only to those with an IP address that starts with '192.168'.

Deny access for users with the following IP addresses

The program will allow access to all users except those whose IP addresses are on the list.

Reject postings to following domains/e-mail addresses

This is a list of e-mail addresses to which you do not want messages to be sent by PostCast Server. The program will refuse to accept any message sent to one of those addresses from the e-mail client. The program can also block postings to specified domains.

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