How long does SMTP svc wait after getting 451 response? -- iis smtp nntp

PeterD
10/20/2005 9:19:43 AM

David,

This is a bit different from what your other message (and my reply)
imply, so I'll take another shot at it...

1. It is possible that the yahoo.co.uk server is 'broken' with perhaps
a full drive or some other problem.

or

2. The yahoo.co.uk thinks you are mounting a flood attack against the
server and is blocking you to sllow the percieved attack down.

I'm leaning towards the second of the two ideas if you are getting the
first few emails to go through then it chokes and dies with later
messages.

The flood attack looks at a connection point, counts the number of bad
addresses, and when a threshold is reached, it will do sometiing to
slow the connection down, or stop it. The idea on slowing down the
connection si that the spammer is using a single thread, and that then
slows down their entire operation.

Regardless, the problem is at their end, IMHO.

Good luck!

On Thu, 20 Oct 2005 10:18:29 +0100, "David Morgan"
[quoted text, click to view]

David Morgan
10/20/2005 10:18:29 AM

Hello

Further to my post below I can now confirm that we are getting 451 errors
from Yahoo.co.uk.

2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - - 220+mta124.mail.ukl.yahoo.com+ESMTP+YSmtp+service+ready 0
0 55 0 0 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionCommand SMTPSVC1
AFSERVER - 25 EHLO - afserver.servername.co.uk 0 0 4 0 0 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - - 250-mta124.mail.ukl.yahoo.com 0 0 29 0 15 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionCommand SMTPSVC1
AFSERVER - 25 MAIL - FROM:<sender_email@servername.co.uk>+SIZE=1189 0 0 4 0
15 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - - 250+sender+<sender_email@servername.co.uk>+ok 0 0 36 0 31
SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionCommand SMTPSVC1
AFSERVER - 25 RCPT - TO:<recipient_email@yahoo.co.uk> 0 0 4 0 31
SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - - 250+recipient+<recipient_email@yahoo.co.uk>+ok 0 0 44 0 31
SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionCommand SMTPSVC1
AFSERVER - 25 DATA - - 0 0 4 0 31 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - - 354+go+ahead 0 0 12 0 47 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - -
451+mta124.mail.ukl.yahoo.com+Resources+temporarily+unavailable.+Please+try+
again+later+[#4.16.3:-70]. 0 0 102 0 62 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionCommand SMTPSVC1
AFSERVER - 25 QUIT - - 0 0 4 0 62 SMTP - - - -
2005-10-20 05:54:13 217.12.11.64 OutboundConnectionResponse SMTPSVC1
AFSERVER - 25 - - 221+mta124.mail.ukl.yahoo.com 0 0 29 0 78 SMTP - - - -

Does anyone know how long the SMTP Service waits before trying again? It's
been over 4 hours without another attempted connection to Yahoo.co.uk
logged.

Thanks

David

David Morgan
10/21/2005 12:03:45 AM

Hi Paul

Thanks for this info. Anyone else having problems with Yahoo, they should
check this page.

http://help.yahoo.com/help/us/mail/defer/index.html

We have now been "whitelisted" whatever that means. I believe our mail will
no longer go in to bulk mail folders but unfortunately we can't deliver it.

What Yahoo don't understand is that in our specific scenario, it is the
owners of these addresses that are putting them an/or mistyping them.

We remove them once a bounce is received but if we can't connect to, in
effect, get a bounce then they remain active and more mails for them join
the queue, therefore flooding closed accounts or whatever.

And... despite having had a couple of emails exchanged with Yahoo, they are
next to useless.

David

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