On 2021-09-21 12:09 p.m., Mark Milhollan via mailop wrote:
Block AUTH from Amazon/Gcloud/Azure by default
Would you include other clouds, like Alibaba, Oracle, OVH, Rackspace,
etc., perhaps especially those that are "too easy" for spammers and
miscreants to get a machine going on? I can understand this sentiment
but be aware it might block your more advanced users, e.g., those
hosting a VPN or mail archive there or a service that does.
Funny you should mention it, the SpamRats team is working on a
RATS-CLOUD RBLDNSD lookup which contain lists of cloud providers with
common problems ;)
While meant to be more of an informative nature, there are certain
activity that you should not really expect from a cloud IP, except MAYBE
desktop in the cloud..
But a person can make special exemptions for the few IP(s) on those
clouds that you expect to do AUTH behavior.. I mean really, not many of
the 21 million Azure IP(s) need to connect via AUTH to your email server ;)
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