Hi Dan - probably need some more info - right now this doesn't look like it has anything to do with your server.
Here's the result of DiGs on the URLs listed. It looks like 216.99.193.2 (ns3.aracnet.com) returns the same IP address for two different URLs, but gets hsbc-val from SECURESERVER.NET and willcraft from easydns.com. hsbc-verifier does not resolve.
This info by itself ought to be enough to get your ISP off your back. I'd say your IP is being spoofed.
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; <<>> DiG 9.2.1 <<>> hsbc-validation.info
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35453
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
;; QUESTION SECTION:
;hsbc-validation.info.      IN   A
;; ANSWER SECTION:
hsbc-validation.info.   3600   IN   A   142.179.200.56
;; AUTHORITY SECTION:
hsbc-validation.info.   3600   IN   NS   PARK17.SECURESERVER.NET.
hsbc-validation.info.   3600   IN   NS   PARK18.SECURESERVER.NET.
;; ADDITIONAL SECTION:
PARK17.SECURESERVER.NET. 115846   IN   A   64.202.165.120
PARK18.SECURESERVER.NET. 115846   IN   A   64.202.167.158
;; Query time: 100 msec
;; SERVER: 216.99.193.2#53(216.99.193.2)
;; WHEN: Mon Nov 22 17:46:21 2004
;; MSG SIZE  rcvd: 144
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; <<>> DiG 9.2.2-P3 <<>> hsbc-verifier.info
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 65332
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;hsbc-verifier.info.      IN   A
;; AUTHORITY SECTION:
info.         7200   IN   SOA   tld1.ultradns.net. domadmin.ultradns.net. 2004225973 3600 1800 604800 3600
;; Query time: 37 msec
;; SERVER: 216.99.193.2#53(216.99.193.2)
;; WHEN: Mon Nov 22 17:50:51 2004
;; MSG SIZE  rcvd: 98
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
; <<>> DiG 9.2.1 <<>> 
www.willcraft.com;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41126
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; QUESTION SECTION:
;www.willcraft.com.      IN   A
;; ANSWER SECTION:
www.willcraft.com.   10800   IN   A   142.179.200.56
;; AUTHORITY SECTION:
willcraft.com.      10800   IN   NS   ns1.easydns.com.
willcraft.com.      10800   IN   NS   ns2.easydns.com.
willcraft.com.      10800   IN   NS   remote1.easydns.com.
willcraft.com.      10800   IN   NS   remote2.easydns.com.
;; ADDITIONAL SECTION:
ns1.easydns.com.   65643   IN   A   216.220.40.243
ns2.easydns.com.   46919   IN   A   205.210.42.20
remote1.easydns.com.   53232   IN   A   64.39.29.212
remote2.easydns.com.   32321   IN   A   212.100.224.80
;; Query time: 268 msec
;; SERVER: 216.99.193.2#53(216.99.193.2)
;; WHEN: Mon Nov 22 17:49:13 2004
;; MSG SIZE  rcvd: 203
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