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Why is port 25 open over VPN?

We have setup an IPsec VPN connection on an XGS 116 and want it to be as restrictive as possible, only allowing RDP traffic to a single PC.

I used a port scanner on the IP address of the PC and it reported that port 25 (SMTP) was open but all others were closed. Why is this?

I tried adding a firewall rule to block port 25 over the VPN and the connection attempts are listed as being denied in the firewall log but the port still shows as open in the port scanners.

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[edited by: emmosophos at 8:52 PM (GMT -7) on 22 Oct 2021]