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
