How to Deal With a Recipient Verification License Violation Message

Recipient Verification – License Violation Message

From talking to customers the most common technical issue people have are problems relating to license count and the error message that result from license violation.
The license usage is based on a rolling average of clean mails over the previous 5 days. The Max daily usage refers to the max usage on any particular day since the product was installed. The Average usage is the average usage since the product was installed .
If you don’t enable recipient verification on your servers you are probably accepting mail for invalid users and therefore your license count will be much higher than it should be. When this happens the license is violated and you will get a message telling you this.
Here I have provided a sample email that is sent when a license is violated. This should help you recognise the problem if it occurs.

Dear John,
Warning: SpamTitan License Violation Detected – (STP-0250-xxxxxx)
You are receiving this email because your SpamTitan installation on “” has detected that the you have exceeded the maximum number of email addresses that your license supports
Please contact to purchase a license for
additional email addresses.
Your current SpamTitan licence will expire in 10 days

To find out if you have recipient verification set up you can do a manual test for recipient verification using telnet. Telnet is a program available on windows and linux that allows a user to connect manually to a server such as a web server or an email server – the email server listens on port 25 on a computer so the command ‘telnet 25’ would connect to our mailserver.

If you get a message like “this server is not responding with 550 code to the invalid user
The text in bold is what the user types:
[rrose@bishop ~]$ telnet 25
Connected to
Escape character is ‘^]’.
220 ESMTP Postfix
mail from:<>
250 2.1.0 Ok
250 2.1.5 Ok

The important part is after the ‘rcpt to’ command. If recipient verification is enabled on the mail server, the server will respond with a 550 code like the following 550 No Such user