People are getting messages when they try to send out through our Exchange server that's part of our SBS 2003 R2 standard network (with 2 nics).
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<exchange.ourdomain.com #5.5.0 smtp;550-"JunkMail rejected - (exchange.ourdomain.com) [22.214.171.124]:37448 is in an>
checking mxtoolbox.com, it says we are on some black lists.
that likely means a machine on the network is infected with a bot, right? there's 35 machines on the network, so any advice on how to proceed?
1 list said the IP was added last night at 7:30PM.
Some people VPN into the office (they have laptops, so they don't have a machine in the office to connect with RWW). If they are using their home machine to connect, and that home machine is infected, checking the office machines won't turn this up and how quick does something get added to the RBLs? A connection at 7PM would be to blame?
another question - how do we have exchange use the RBLs to help cut down spam coming into our machine?