3 Jan
2017
3 Jan
'17
4:12 p.m.
On 01/03/2017 03:09 PM, Mike Kellenberger wrote:
We are seeing problems with greylisting in mails coming from UPC mailservers. After receiving our "451 Greylisting" response, we never see a retry of the mail again. The sender does not receive an NDR. We have seen this behaviour from the servers at 84.116.36.xxx. Other servers for example the ones in the range 62.179.121.xxx are retrying correctly.
Now that you mention that...
I have seen the same behaviour since January 1.:
reject: RCPT from vie01a-dmta-ch02-1.mx.upcmail.net[84.116.36.94]: 450 4.= 2.0
and then was never seen again (at least with that mail) and alos never sent a NDR at all.
--
Matthias Egger
ETH Zurich
Department of Information Technology maegger@ee.ethz.ch
and Electrical Engineering
IT Support Group (ISG.EE), ETF/D/102 Phone +41 (0)44 632 03 90
Sternwartstrasse 7, CH-8092 Zurich Fax +41 (0)44 632 11 95