Dear Sir,We have a Website(done in php)NewsPaper Site, wherevisitors have the option to send an article to a friend using PHP Form from the site.so the e-mail will be sent through SMTP virtual server 2003.But it seems that spammers are passing spam through our server, they are using our SMTP to send Spam..and thousands of e-mails will sit in our Queue Folder.What are the SMTP settings to prevent Spammers??? where I have to give Authentication( where to put the username and password, I can use any username or there is a specific one)to let only authenticated people to relay e-mail through SMTP ???Thanks in Advance,if you have any suggestions and help i'll be more than thankful, Regards,suzi

Hi Suzi,The first thing what we sould clearify that the spammers are sendig mail trough your php application or through your SMTP server. You should run an Open Relay testagainst to your SMTP Server.It can be found here:http://www.abuse.net/relay.htmlIf this test give a positive result, you should change the SMTP Server configuration. I recommend to only allow IP address of your web server for relay.If you let only authenticated people to relay it means that anybody who can successfully authenticate on your server (Machine local users and AD users) can send relaying message. You cannot restrict it further. If any of your user has a weak password it is a possible threat.Regards,Zoltnhttp://www.clamagent.org - Free Antivirus for Exchange http://www.it-pro.hu http://emaildetektiv.hu

Dear Mr. Zoltan Gomori,Thanks a lot for your reply, very Helpful.I sent an emptye-mail to new@abuse.net because i'am not a registerd user in the order to receive a password, and i'am still waiting.do you advise me to use Anonymous mode or the Registered user mode . one more question, the test should be done from the web server where the SMTP is installed?? before doing the test,I tried to change the SMTP Server configuration. Iaddedonlythe IP address ofthe web server for relay. and i checked " Only the List below" and then i tried to send an e-mail from our website, but unfortunately the e-mail was not sent.any suggestion please...very important for methanks a lot.. Best Regards, suzi

Hi,Did you restart the SMTP service after making configuration on the SMTP virtual server? Meanwhile, please ensure the Anonymous access was selected on the Authentication button under SMTP virtual server.ThanksAllen

Hi,when the IP address didn't works, i set the Domain name, under Relay Restriction..in a way that i granted permissions for only that pass through this domain name, and till now it works well...thanksa lot.suzi

Hi Nana, Read the below article it is a step by step article and cross check your smtp relay settings against mentioned in the doc. this should really help you. http://www.petri.co.il/preventing_exchange_2000_2003_from_relaying.htm Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|