Unable to send bulk email, config problem?

One of my clients is trying to send a bulk email to all his members using Invision Power Board (roughly 235 members), it says it has sent the mails ok, but nobody is receiving any mails...
He has tried mailing individual members from the board so we are prety sure thats not the problem (unless the there is a bug)

I have checked the mailq and its almost empty (just 2 undeliverables from the previous day)
I have also checked the mail logs, the closest entry to the time he sent tried to send the bulk email is
Dec 22 17:43:26 www sendmail[17583]: gBMHhQ517583: from=httpd, size=993, class=0, nrcpts=0, msgid=<200212221743.gBMHhQ517583@www.mydomain.com>, relay=httpd@localhost
I am not entirely sure what this particular line means though

All I can think is that maybe sendmail is configured incorrectly for this purpose and is preventing bulk emails from being sent... how would I check this? probably some setting in sendmail.cf I have missed

Running a Cobalt RaQ 4 if that matters at all

Thanks in advance for any help you can provide me

 

 

 

 

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