Greetings, We're a medium sized regional MSO/broadband provider with 200k+ mailboxes, strongly considering enabling SMTP authentication on our customer-facing SMTP mail servers. We feel this is the next logical step to minimize our users UCE/virus impact (we already tarpit, virus scan, UCE scan, subscribe to RBL's, reject prior to SMTP close). I'm looking for comments on whether this is generally seen as a positive change or a waste of time (ie - will the next virus or worm gleam your SMTP username and password from Outlook Express and use it to replicate/SPAM)? Is anyone aware of any well known mail clients that do not support SMTP authentication (Unix, Windows or Mac)? Thanks in advance. --Dan -- Daniel Ellis, CTO, PenTeleData (610)826-9293 "The only way to predict the future is to invent it." --Alan Kay