Entourage 2008 Issues

Hi everybody,

I looking for some help about an error I'm having when sending emails to a list of recipients y just created in my MacBook Pro, I handle a pop3 account from my Company and I do recieve email but I'm unable to send only in the case of using a pre created list, for example If I want to send an email to Directors I use Directors list name wich includes maybe 20 director's names on it, and with copy to 4 managers in the same email, it just don't let me send it I verified the acc password and settings that include smtp and pop server, I was advised about a possibility of an Entourage bug when this cases happen,

I will really appreciate your help,
PS:I'm the systems guy and this case is with the Big Big Boss' Mac Book Pro,

Best Regards.

Clearing more points about my case

1.-I'm able to send/recieve email from that account when simple addresses are added (not a distribution list), wich means that pop3 and smtp config were done right.

That's all y left to explain

Thank you.