BarricadeMX experiences

[Steve Freegard]

UxBoD wrote:
> Any reported FPs Steve ?

Yes - of course.  We recommend a set of tests and configuration that 
we've done the most testing with and each user can add or remove tests 
as they see fit.  Most existing sites have a handful of whitelist 
entries and no site is exactly the same.  Some SMTP servers are 
terminally broken as are some sites configuration (DNS etc.) - it 
depends on your definition of a false-positive in some cases too. 
Anyway as everything is done at the SMTP level then these are quickly 
caught as the sender knows that delivery was unsuccessful via a DSN 
generated by their mail system.

We've got a number of safeguards around some tests to help reduce or 
eliminite false positives.  Our greylisting functions for example are 
completely different to all the other existing implementations and has 
far less problems than with traditional greylisting - ours copes nicely 
with clustered or NFS mounted spools where the sending system is 
potentially different on each retry (for example you don't need to 
exempt Hotmail/Yahoo/Gmail as they will pass greylisting and become 
auto-whitelisted).

Kind regards,
Steve.