How to check if some one is spamming from my server (Linux Plesk 8.x)

If you see a lot of smtp connections or your server gets constantly in spam black lists, maybe you should check if some bot spams through your server. The are 2 cases of spamming through a box: 1)using unsecure php forms that bots abuse 2)using smtp connection from an outside client this artice is about ...

How do i send emails from my Web Application ? (.NET & ASP)

here you can find various ways of sending emails with .NET 2 / .Net 1 CDONTS / Persist’s AspEmail / VB / PHP etc

Block LIBWWW-PERL and web addresses to protect your site from botnets

Not only do I block all accesses from libwww-perl, I also log what they were looking for which turns up an amazing amount of botnet hits on a daily basis just randomly hitting websites trying to find a way inside.

How to Prevent the IIS SMTP Virtual Server from Relaying E-mail Messages

Do the following: 1) Start Internet Information Services Manager or open the Internet Information Services (IIS) snap-in. 2) Expand Server_name, where Server_name is the name of the server, right-click Default SMTP Virtual Server, and then click Properties.

Windows: Using Group Policies to Restrict Programs (Protect from Viruses and Worms)

You can use a group policy to protect your server from known viruses that require an executable to run. For example, Sobig.F and Blaster are two fine examples.