The Brightmail Gateway is an appliance that installs with its own hardned OS (Which happens to be RHEL 5)
The Brightmail Message Filter 6.1.1 is supported on RHEL 4 and 5 in 32-bit and 5 64-bit. But still just RedHat, not SuSe. Like Ben said though, it may work.
Title: 'Release Notes for Symantec Brightmail Message Filter 6.1.1'
Document ID: 2009050713475254
> Web URL:
http://service1.symantec.com/SUPPORT/ent-gate.nsf/docid/2009050713475254?Open&seg=ent