Re: [courier-users] Dialback verification? (e.g. smtp sender check)

[Bill Taroli]

Doesn't SA have a check for this very thing? Not sure if you're using it 
with amavisd-new as a courierfilter or not. But then I suppose it 
wouldn't be too had to graft the code from SA into a Courier::Filter 
script and drop it in as a filter to cause such messages to bounce upon 
submission. :-)

Jeff Potter wrote:

Does anyone know of any courierfilter implementations (or even C 
programs) that do dialback verification?  (That is, given an email 
address, connect to the given domain's MX and verify that the server 
will accept email destined to the address in question?)

I know Gordon has written something in Python but had unresolvable 
issues with it.  I'm seeing a definite increase in the number of junk 
messages with bad from addresses bouncing into my postmaster account 
(because some of our users have forwards to other servers that have 
dialback), and would love to cut them off at the knees.

best,
Jeff


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