anybody here from verizon's e-mail department?
Joe Maimon
jmaimon at ttec.com
Wed Feb 22 16:35:06 UTC 2006
Dave Pooser wrote:
>>Which probably means Paul is blocking whatever server Verizon is using
>
> for its
>
>>sender verification
>
>
> Something I've seen before is a lot of mail servers will wait 10-45 seconds
> before presenting an SMTP prompt to remote hosts; spambots typically won't
> wait that long and give up. But since Verizon's sender verification (as of a
> couple months ago; haven't checked recently) times out after 30 seconds,
> that technique can have the side effect of making Verizon customers
> unreachable.
What about sender verification of validity discourages spammers?
The only reason it works is that they are too lazy to actualy use some
random VALID forged return-path.
I for one would not like to force spammers to start using valid
return-paths. I dont need that blowback load. That would affect my
ability to read NANOG, hence its on-topicness.
IOW why isnt this technique (not pionered by verizon, afaik the
milter-sender was first I saw of it) short sighted and dangerous in the
long run?
And yes, put this together with sender-id/domainkeys/spf whathaveyou and
then its valuable. However thats not the world we live in now.
Joe
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