Testing your mailserver when using SpamExperts

Question:
What to do if suddenly the SpamExperts cluster gets stuck.
Answer:
If the SpamExperts cluster gets stuck, there might be a problem with your (customers) mail-server where the mail gets delivered in the end.
You can test this yourself by simulating a mail-delivery to this mailserver.
In a Windows cmd-shell or on a UN*X/Linux/Mac console, type the following commands.
 Below is an example, you can use your own data at underlined places:
Command-shell>  telnet mail.mycustomer.be 25
220 MICROSOFT EXCHANGE 0.1 ESMTP Mail Server Ready
(You should receive a 220-response)
Command-shell>  helo myrandomname
250 HELO 85.159.97.15 , Nice to meet you!
(You should receive a 250 response)
Command-shell>  mail from: myownmail@weprovideyoumail.be
250 Ok
(You should receive a 250 response)
Command-shell>  rcpt to: info@mycustomer.be  <--- Enter a valid mail-address where mail should be received
250 Ok
(You should receive a 250 response)
Command-shell>  data
354 End data with .
(Server gives a 354 message, accepting the mail)
You can quit now, or actually type data to send a mail. End it with a single dot (.) on a line and enter to send it.
If you get other responses or no response at all, there might be a problem with the mailserver.