preventing backscatter at the source

[Greg Matthews]

Julian Field wrote:
> I have 1 use for a backup MX (or 2 MXs in my case). Unless your primary 

I have another use for a secondary (lower priority) MX, very useful for 
providing a real, live mail feed for testing and change control. Perform 
upgrade, listen on secondary MX IP address, check all is well with 
upgrade. The important part is make sure all mail that goes to this 
secondary/test MX is sent directly to /dev/null. Also, stop listening 
when not in use - there are a number of corner cases which can result in 
valid mail going to your invalid MX even if you have triple redundant 
primary MXs.

GREG

-- 
Greg Matthews           01491 692445
Head of UNIX/Linux, iTSS Wallingford

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