Hi. On SMTP virtual server and go under relay restrictions make sure the radio button is checked "only these servers may relay" and bottom " Allow all successfully authenticated ......................................... to send mails " Option is checked. and cherck for anonymous access is not checked on relay. and furthur refer to article from msexchange.org link is in mark's mail. On 8/9/05, Mark Fugatt <markfu@xxxxxxxxxxxxx> wrote: > http://www.MSExchange.org/ > > By default Exchange 2000 and Exchange 2003 do not allow unauthorised > relaying, this article explain how to check: > > http://www.msexchange.org/tutorials/MF005.html > > Mark Fugatt > Dedicated Supportability Engineer (Exchange) > Microsoft Services Organisation > Desk: +44 (0)118 909 5630 > Mobile: +44 (0)7966 858108 > MSN IM: markfu@xxxxxxxxxxxxxxxxx > Blog: http://www.msmvps.com/exchange > http://www.microsoft.com/support > Dedicated to proactively supporting Microsoft's enterprise Customers > This email may contain confidential information. If you are not named on > the addressee list, please take no action in relation to this email, do > not open any attachment, and please contact the sender (details above) > immediately. Information in this email is provided in good faith. If you > are a customer of Microsoft, please refer to the terms and conditions > which cover the provision of support and consulting services to you/your > organization. If you are not corresponding in the course of, or in > connection with a Microsoft contract or program with its own terms and > conditions, please note that no liability is accepted by Microsoft for > the contents of this mail. > > > -----Original Message----- > From: Nicolas Verhaeghe [mailto:nicolas@xxxxxxxxxxxxxxxxxxx] > Sent: 08 August 2005 18:45 > To: [ExchangeList] > Subject: [exchangelist] How to prevent unauthorized use of my SMTP > server? > > http://www.MSExchange.org/ > > How do I make sure that my SMTP server is not open to the rest of the > world? > > It seems that I need to have port 25 opened in my firewall to allow > incoming mail, but when I do that, don't I risk letting outsiders use my > SMTP to send their spam? > > How can I monitor this activity and also how can I make sure that no > non-authenticated users use my Exchange server? > > Thanks a lot! > > ------------------------------------------------------ > List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist > Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp > ------------------------------------------------------ > Visit TechGenix.com for more information about our other sites: > http://www.techgenix.com > ------------------------------------------------------ > You are currently subscribed to this MSEXchange.org Discussion List as: > markfu@xxxxxxxxxxxxx To unsubscribe visit > http://www.webelists.com/cgi/lyris.pl?enter=exchangelist > Report abuse to listadmin@xxxxxxxxxxxxxx > > ------------------------------------------------------ > List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist > Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp > ------------------------------------------------------ > Visit TechGenix.com for more information about our other sites: > http://www.techgenix.com > ------------------------------------------------------ > You are currently subscribed to this MSEXchange.org Discussion List as: > manjunatha.bn@xxxxxxxxx > To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist > Report abuse to listadmin@xxxxxxxxxxxxxx > -- Thank you manju Exchange administrator -IBM