# 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:

> <table><tbody><tr><td>**Command-shell&gt; telnet <span>mail.mycustomer.be</span> 25**  
> 220 MICROSOFT EXCHANGE 0.1 ESMTP Mail Server Ready
> 
> *(You should receive a 220-response)*
> 
> **Command-shell&gt; helo <span>myrandomname</span>**
> 
> 250 HELO <span class="ipaddr">85.159.97.15</span> , Nice to meet you!
> 
> *(You should receive a 250 response)*
> 
> **Command-shell&gt; mail from: <span>myownmail@weprovideyoumail.be</span>**
> 
> 250 Ok
> 
> *(You should receive a 250 response)*</td><td>  
> <div id="bkmrk-">![](https://openprovider.help/uploads/images/gallery/2026-08/embedded-image-epyilkzt.png)</div></td></tr></tbody></table>
> 
> **Command-shell&gt; rcpt to: <span>info</span><span>@mycustomer.be</span> &lt;--- Enter a valid mail-address where mail should be received**
> 
> 250 Ok
> 
> *(You should receive a 250 response)*
> 
> **Command-shell&gt; 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.