What about implementing rate limiting on inbound SMTP at the gateway router to reduce the load at assp?
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrew Porter Sent: Thursday, 19 April 2007 9:02 PM To: Questions and Answers for users of ASSP Anti-Spam SMTP Proxy Subject: Re: [Assp-user] another bombarded server Charles Marcus wrote: > Andrew Porter wrote: >> Ethan Albone wrote: >>> I have this list too , if you read carefully my email you understand >>> the problem is another. These email were all rejected due to invalid >>> address. >>> The problem starts when you receive 10 email seconds to >>> [EMAIL PROTECTED] always using always a new ip . >>> It overloads Validate Recipient Addresses , believe me. > >> I can't see why looking up an IP address in a list would be any quicker >> than looking up a From: address - so the load of performing the lookup >> isn't an issue. >> >> The only real difference is that the incoming mail has to be read up to >> the rcpt to: line - but if the IP address is constantly changing the >> email is going to have to be read up to the point of determining it's >> SPAM anyway. So Validating the Recipient is the appropriate (and really >> only) defence against this. > > Hmmm... does Validate Recipient happen *before* the IP is read? No - connections are refused from IP addresses without any conversation at all. But in this case we cannot blacklist the IP address anyway - it's constantly changing. The only defence against it is content analysis and recipient validation is one of the least costly. It might be worth investigating if it is performed before other more costly checks such as RBL etc.. and move it nearer the front if it isn't. I favour rejecting as much as possible with as little overhead as possible first before doing costly checks. ------------------------------------------------------------------------ - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Assp-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/assp-user ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Assp-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/assp-user
