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Re: verizon.net and other email grief

  • From: Crist Clark
  • Date: Fri Dec 10 18:19:53 2004

Krzysztof Adamski wrote:

On Fri, 10 Dec 2004, Jeffrey I. Schiller wrote:


On Fri, Dec 10, 2004 at 12:26:59PM -0500, Rich Kulawiec wrote:

One thing that's not clear is whether or not Verizon caches any of
this information.
It appears that they do some amount of caching.

			-Jeff

It does not appear that they are caching it, here is a sample from my log
file:

Dec  6 19:18:15 white sm-mta[25976]: iB70IF6n025976: <[email protected]>... User unknown
Dec  6 19:18:15 white sm-mta[25977]: iB70IF6n025977: <[email protected]>... User unknown
Dec  6 19:18:16 white sm-mta[25976]: iB70IF6n025976: from=<>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=sc006pub.verizon.net [206.46.170.182]
Dec  6 19:18:16 white sm-mta[25977]: iB70IF6n025977: from=<>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=sc019pub.verizon.net [206.46.170.68]
Dec  6 19:18:16 white sm-mta[25976]: iB70IF6o025976: <[email protected]>... User unknown
Dec  6 19:18:16 white sm-mta[25977]: iB70IF6o025977: <[email protected]>... User unknown
Dec  6 19:18:16 white sm-mta[25976]: iB70IF6o025976: lost input channel from sc006pub.verizon.net [206.46.170.182] to MTA after rcpt
Dec  6 19:18:16 white sm-mta[25976]: iB70IF6o025976: from=<[email protected]>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=sc006pub.verizon.net [206.46.170.182]
Dec  6 19:18:16 white sm-mta[25977]: iB70IF6o025977: lost input channel from sc019pub.verizon.net [206.46.170.68] to MTA after rcpt
Dec  6 19:18:16 white sm-mta[25977]: iB70IF6o025977: from=<[email protected]>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=sc019pub.verizon.net [206.46.170.68]

What happens when verizon tries to send email to somebody who does the same
type of check, does this not create an infinite loop?
Not if Verizon treats the antispam[0-9]+ mailboxes in a special manner
and answers without a check. And they have to answer that the box exists
or things are gonna _really_ break.

Doing a quick test using the last antispam[0-9]+ address in my SMTP logs,
I got all 250 responses without a more recent call back.
--
Crist J. Clark                               [email protected]
Globalstar Communications                                (408) 933-4387