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You got _no_ errors? Nothing to either of the partain@foo.com 
address or the roundup admin address?? 
 
What method are you using to handle email? 
 
The Roundup mail handler traps all errors in its code and reports them 
back to either the sender (if it's known) or the roundup admin (if 
there's no From address in the mail). 
 
Was it always three messages that didn't work? Always the last three? 
What's your local sendmail queue length - is there a chance that 
sendmail refuses to queue 20 messages (well, maybe less, depending 
on how quickly roundup processes the messages)?