My problem is more of questions with the "null sender". It seems that I am getting slammed with tons of spam as of nov 1,2006 and installed the toaster as the front end to the mail mail mailserver. the toaster is getting slammed hard and 99% of the emails are from "null sender". I'd love to just drop the connection for the "null sender".
Sure, different ways you could do it. However, you are going against the RFC (http://www.faqs.org/rfcs/rfc821.html). In other words, you will be "breaking" the NDR's. Dont look at dropping the NDR's but look at what these NDR's are, why are you getting so many of them? Have you set your domain to "bounce" messages for non-exsitant users? This way chkuser can do its job properly. NDR's are the by products of SMTP, and spammers are now using them as the last resort to deliver spam in form of NDR's. My concurrencyincoming is set to 600 and it fills up
(600 out of 600) within seconds and stays there. With the connections tapped out, legitimate emails do not get through because the server is is almost constantly at 600/600. I've thrown a second MX server in line and that too fills up almost instantly. (700/700... thats 1300 connections in a blink of an eye!)
Well you have a serious problem there, agreed. But again look at the connections, look at the logs, what and where are these connections from? Null sender is your least of worries. You sure you havent opened up your server for relay? What's in /home/vpopmail/etc/tcp.smtp? HTH Harman
