RE: [exim] sender verify at verizon.net (sigh)

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Autor: Larry Rosenman
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A: 'Thomas Bushnell BSG', exim-users
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Assumpte: RE: [exim] sender verify at verizon.net (sigh)
Thomas Bushnell BSG wrote:
> I run a small mail server (exim4 on Debian) and on that server hosts
> several email lists. One of them includes a member at verizon.net,
> and his address recently started failing. He changed his address to
> verizon.net in mid-December and all worked well until last Friday.
>
> At that point, all email to him (either through the list, or
> directly) cannot get through.
>
> The message would be actively rejected thus:
>
> 2005-02-21 09:10:53 1D3H4F-00089S-LH == bcebsg@???
> <gregorians@???> R=dnslookup T=remote_smtp defer (0): SMTP
> error from remote mailer after MAIL
> FROM:<gregorians-outlist-owner@???> SIZE=2524: host
> relay.verizon.net [206.46.232.11]: 450 Requested mail action not
> taken-Try later:sv6.verizon.net     

>
> And immediately before (coincidence? not!) would be the following
> curious log entry:
>
> 2005-02-21 09:10:53 SMTP protocol violation: synchronization error
> (input sent without waiting for greeting): rejected connection from
> H=vms142pub.verizon.net [206.46.252.142]
>
> Now I'm inclined to blame it on the apparent use of VMS as an
> operating system by Verizon. Maybe not.
>
> After more thought, I realize that Verizon is using broken sender
> verification, sending a fake message back to the sender of the
> message (in this case, gregorians-outlist-owner@???) and
> the fake message checkback is not following SMTP synchronization
> rules!    
> Idiots.  Ok, so I go back to my config and I turn off
> smtp_enforce_sync, thinking this should get the checkback to succeed. 
> Later checking on email lists shows that Verizon does have this bug.
> But it's unclear why mail to my correspondent worked fine for two
> months before now. 

>
> But making this change doesn't help. It still fails with apparently
> the same error, though I of course no longer get the synchronization
> errors:
>
> 2005-02-21 12:38:10 1D3H4F-00089S-LH == bcebsg@???
> <gregorians@???> R=dnslookup T=remote_smtp defer (0): SMTP
> error from remote mailer after MAIL
> FROM:<gregorians-outlist-owner@???> SIZE=2524: host
> relay.verizon.net [206.46.232.11]: 450 Requested mail action not
> taken-Try later:sv3.verizon.net     

>
> Sometimes the error is different and the message simply times out:
>
> 2005-02-21 11:47:31 1D2yaG-0005rh-E7 == bcebsg@???
> <gregorians@???> R=dnslookup T=remote_smtp defer (110):
> Connection timed out: SMTP timeout while connected to
> relay.verizon.net [206.46.232.11] after MAIL
> FROM:<gregorians-outlist-owner@???> SIZE=4682    

>
> I would like to see what's happening on the checkback transaction,
> but mail transactions that disconnect after the RCPT succeeds don't
> seem to be logged.
>
> The IP address of my mail server (becket.becket.net) doesn't seem to
> be on any block lists; my ISP is fine with what I'm doing; my DNS is
> all happy; and reading mailing list archives suggests that this
> happens every now and then.  Is there anything I should try other
> than just telling my correspondent that as long as he uses Verizon
> and they don't fix it, he can't get mail through my server?     

>
> Thomas


AHA!!!!!!!!!!!!!
Someone else with issues with Exim and Verizon.net :)


Count Volume Oldest Newest Domain
----- ------ ------ ------ ------

    2    16KB      8m      5m  ccsl.com.np
   82  1019KB     28h      2m  default.net.nz
    8   361KB     57h     37m  gte.net
  194  2357KB     20h      3m  verizon.net
---------------------------------------------------------------
  286  3753KB     57h      2m  TOTAL



Mon Feb 21 15:00:14 CST 2005


I also have ~20 messages queued on my home exim box.

Verizon.net refuses to talk to me since I'm not a customer.

I don't even see verizon attempting to talk to my server.

I also see timeouts after the mail from:<xxx@???> when I talk to them.

Also, raw telnet to the port causes the same behaviour.

Is anyone from verizon.net here?



-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 972-414-9812                 E-Mail: ler@???
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749