As in, you want to disallow open relaying? What version of Exchange are you working with? Matt -----Original Message----- From: Guido Silva [mailto:guido-listas@xxxxxxxxxxxxx] Sent: Tuesday, May 28, 2002 2:25 PM To: [ExchangeList] Subject: [exchangelist] SMTP restrictions http://www.MSExchange.org/ - Re-Vamped! How can i configure SMTP virtual servers to only accept messages if users authenticate AND uses a email address that is handled by Exchange. Example: Exchange handle this emails domains: xpto.help.com and help.help.com . When user configures the outlook express , and use the account that exist in Active Directory with right password , but the email domain of email address is socorro.com , the message is sent without any problems. But i need to restrict the users to only use emails domains xpto.help.com and help.help.com however they authenticate. ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: matt.walkowiak@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')