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RE: [Asrg] Verizon's asymmetrical anti-spam causing problems

2005-03-08 05:47:36
The SAFEST return address for probes of that type would be a 
null sender <>, simply by virtue of it not generating a 
reply. However, some very misguided postmasters block support 
for null senders, which also effectively blocks bounce 
messages, without having any real impact on blocking spam.

They are using a null from first, ie. <>, and if they receive a 500-series
error after the 'mail from:' command or after the 'rcpt to:' command, they
issue a 'rset' (reset) and issue 'mail from:
antispam******(_at_)west(_dot_)verizon(_dot_)net', the asterisks representing a 
string of six
random numbers.  They setup a wildcard account for west.verizon.net on the
mail system in case the remote host performs Sender Verifications checks.

-Dennis "Used to work for Verizon abuse" Dayman


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