Hello Due customer complaints I started inspecting our logfiles for UPC anomalies.
Indeed, UPC seems to have migrated it's email services from austria (chello.at ip range) to a Liberty Global IP range in NL This range is not yet whitelisted by SWINOG or DNSWL.org so our infrastructure applies greylisting. And I also see, that delivery is attempted only once, never overcoming greylisting unless the sender tries again within the right time window. Worse! The sender does not get any kind of error back, that his email did not get delivered. Opening at trouble ticket at UPC switzerland is probably useless as in the past they were unable to forward those ticket to the mail infrastructure operators. Also email to the 'postmaster' of the affected customer domain never get replied. So does anyone have a direct contact to the operators of the UPC email infrastructure in the netherlands? Does anyone know the IP range UPC uses for it's upcmail.net service? They don't use SPF where I could extract the ranges and whitelist them. Kind regards -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
