| Single copies do not have a lot of effect on the overall statistics from the processing of 25000 mails. The best way to not get mail "spammed" is to correspond with the sender, thus whitelisting their address.
If the sender is a read-only mailing list then you need to whitelist it by sending a TEXT ONLY email (ie not mixed text/html) to whitelist at ns1.knots.net with 1 address per line in the body every now and again.
Please remember that the sender will be found in the X-Assp-Envelope-From header line which you can find by inspecting the properties of the message
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