Use the MAXBSMTP and SORT_RECIPIENTS configuration keywords. They are explained in the manuals and the site.exe help. You have to experiment a little to find the best value for your situation. 

Note that Hotmail is notorious for setting their servers to respond in non-standard ways, which can affect your list deliveries; I had to use MAXBSMTP=20 for a while because Hotmail's servers used to terminate SMTP transactions after 20 RCPTs. Yahoo is practicing greylisting, so you will currently have trouble with them, unless your subscribers add your sending address to their address books and add DKIM signing to your Listserv configuration (see the manuals).

>>> Jesus Alonso Rivas y Rivas <[log in to unmask]> 2/16/2007 12:42 PM >>>
hi dude's.

Do any body knows how doe's ListServ arrange, sort or mannage the emails 
address dristibution? Is it sorted by email address alphabetically, or 
by domain name alphabetically too?
This is because our SMTP provider is telling us that ListServ is 
grouping the delivery by domain causing some servers (hotmail, yahoo...) 
rejecting our messages because they think we might be attacking them.

If so, is there any other way to configure it?

Thanks a lot and best regards,