[BBLISA] Verizon help

[Dean Anderson]

Shouldn't reply to my own message. But in case it isn't clear, the reason 
this is a bad idea is:

1) Performance. Verizon's mail server has essentially doubled its load. If
a mail server or nameserver (theirs or yours) is slow, it will cause a
temporary failure, as you saw. If their nameserver is slow, or one fails,
it will cause a performance knee with a storm of increasing defer retries
which will quickly bring the server to its knees.

2) Many sites monitor "NOQUEUE" connections, and automatically blacklist
those IP addresses which make too many NOQUEUE connections. A lot of
"testing" by Verizon will automatically get them blacklisted.

3) There is no guarantee that a from: address receives email. This is a
feature that spammers certainly exploit, but there is are legitimate
reasons for this: many machine email senders send mail and never receive
mail. Any mail for those robots will be rejected.  So the premise of the
test (that every sender can be verified) is invalid.  Of course, any one
stupid enough to violate 1 and 2 above, will certainly be unable to grasp
the subtlety of this.

		--Dean


On Sat, 21 Feb 2004, Dean Anderson wrote:

> 
> Verizon is trying to do a "sender verification test".  This is a dumb idea 
> whose time didn't come.  But no matter.
> 
> Here is a message from Randy Bush on the subject.  I frequently disagree 
> with Randy, but in this case, I think he has the right idea.
> 
> 		--Dean
> 
> 
> =================
> 
> > I think he's saying that they were unable to perform the
> > validation hence the 450.  If the validation was successful,
> > they'd return a 200 series code, if it was unsuccessful, they
> > would return a 500 series code.
> 
> nice words, but crap.  due to needs to spool mail for sites in
> countries with very poor connectivity, mail spool time here is
> quite long.  if verizon and others seem unable to decide in weeks,
> why should i pay the penalty?
> 
> but, i guess the problem is easily solved with exim config.  i have
> set it so that if it can not deliver to verizon in say one hour, it
> dumps the mail.
> 
>     verizon.net        *           F,1h,5m
> 
> life is simple, except for verizon users i guess.
> 
> randy
> 
> 
> 
> 
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