I think they are spidering for email addresses they can use for spam. Their address 64.27.20.246 is being used by koonsmazda.cn to receive links from their email spam activities. They are using my companies email as the sending email in their spam campaingn at the moment and I urge anyone suffering the same problem to search their backbone supplier and get it shut down.

Network operations for them is

Name: CalPOP Network Operations
Handle: CNO4-ARIN
Company: ATMLINK Inc.
Address: 600 W. 7th Street
Address: Suite 360
City: Los Angeles
StateProv: CA
PostalCode: 90017
Country: US
Comment:
RegDate: 2003-01-10
Updated: 2003-09-10
Phone: +1-213-627-1937 (Office)
Email: noc@calpop.com