recommendations for maxrecipients?

Hi guys,

Any recommendations on a sensible value for a "maxrecipients" setting
(i.e., the maximum number of RCPT TO: for a SMTP mail session). I
usually set it to 200, but was thinking of reducing it to 100, just for
fun. Some web page recommends 250. I've seen PHP mailform exploits that
send to 400 recipients. Will 100 be too restrictive for daily use? Will
my users [webhosting clients] complain, I wonder?

Regards,
Pascal Damian