Howdy list, I'd like to insert an SMTP filter proxy between tcpserver and qmail (or, in my case: rblsmtpd) that reads a file or cdb containing all of the domains in my rcpthosts file, and REJECTS messages that are addressed FROM one of those domains UNLESS the RELAYCLIENT environment variable is set (which would mean that it's legitimate email from one of my customers).
Does anyone know of a program that can do this? The idea seems relatively simple, and I can't immediately think of any problems with it. And Implementing it would greatly reduce spam with forged headers claiming to be from one of my customers. -- Jesse Guardiani, Systems Administrator WingNET Internet Services, P.O. Box 2605 // Cleveland, TN 37320-2605 423-559-LINK (v) 423-559-5145 (f) http://www.wingnet.net We are actively looking for companies that do a lot of long distance faxing and want to cut their long distance bill by up to 50%. Contact [EMAIL PROTECTED] for more info.