Calyptix, IP blocks, and SMTP servers

Calyptix Access Enforcer firewalls are great.  I’m writing this post from behind our AE1000 right now.  I’m a big fan of theirs and intend to deploy many more at our customer sites as we refresh their existing firewalls and servers.  That said, there is a bit of an issue with the SMTP aliasing right now.  If you are using a single IP, or have it behind another NAT device (normally a DSL or cable broadband endpoint) then you are okay.  But if you have a block of IPs configured in the Calyptix be careful.  If you have x.x.x.21 as the … Continue reading Calyptix, IP blocks, and SMTP servers