NinerNet Communications™
System Status

Server and System Status

NC036: Problems with shaw.ca again

13 July 2021 19:21:41 +0000

Shaw Communications Inc. and their mail filtering sub-contractor (Cloudfilter/Cloudmark) are again delaying, and now even bouncing, email sent to shaw.ca addresses. However, we have no way of communicating with Shaw mail server admins, so we cannot talk to them about how their filtering practices are non-standard and unpredictable.

Our mail server is still/again not in any of the 250 major blacklists that we monitor, so it is unclear why Shaw/Cloudfilter are causing this problem. If you are a Shaw customer, we strongly recommend that you contact Shaw and complain. We also recommend that you do not forward your email to any addresses on their domain.


Update, 2021-07-13 15:45 (PDT): Bounce messages will contain this line, or something very similar to it:

host shw-central.mx.a.cloudfilter.net[3.96.81.40] refused to talk to me: 421 shw-ibgw-4001a.ext.cloudfilter.net cmsmtp too many sessions from 178.62.195.26 AUP#CNCT

Normally bounce messages can be easily deciphered, but even we don’t know what this means or how it makes any sense.

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Systems at a Glance:


Loc.SystemStatusPing
Server NC023, London, United Kingdom (Relay server), OPERATIONAL.NC023OperationalUp?
Server NC028, Vancouver, Canada (Monitoring server), INTERNAL.NC028InternalUp?
Server NC031, New York, United States of America (Web server), INTERNAL.NC031InternalUp?
Server NC033, Toronto, Canada (Primary nameserver), OPERATIONAL.NC033OperationalUp?
Server NC034, Lusaka, Zambia (Phone server), INTERNAL.NC034InternalUp?
Server NC035, Sydney, Australia (Secondary nameserver), OPERATIONAL.NC035OperationalUp?
Server NC036, Amsterdam, Netherlands (Mail server), OPERATIONAL.NC036OperationalUp?
Server NC040, Toronto, Canada (Web server), INTERNAL.NC040InternalUp?
Server NC041, New York, United States of America (Web server), OPERATIONAL.NC041OperationalUp?
Server NC042, Seattle, United States of America (Status website), OPERATIONAL.NC042OperationalUp?

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