Problem with bcc

[Bernhard E Krevet]

I am sending monthly invitations to about 100 persons. I am using one 
of my own email addresses in the To: field and all others as 
bcc:

It appears that all receivers get the mail just fine except for 
Compuserve (xxx@cs.com). I talked to Compuserve technical support who 
couldn't find anything faulty on their part. Could it be a spam filter 
somewhere in the network? 

Does anyone on this list have any experience and/or suggestions?
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Phone: 707-254-9424
EMail: krevet@ibm.net