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[126.96.36.199]: 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 maeg...@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
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