Hi all,
We're seeing a large number of unsubscribe requests for different
contacts from the same IP addresses, all located with Azure
infrastructure. The list members in question have informed us that the
requests were not initiated by them. I appreciate there are situations
when this can happen, it's just that this seems particularly unusual and
we've had a spike in such complaints.
I'm just wondering if anyone is seeing anything similar and/or whether
anyone knows what the cause could be? Is there some sort of known
harvesting of such links from email content? Or is something incorrectly
scanning/opening unsubscribe links with a POST request?
Many of the IP addresses seem to be listed on AbuseIPDB. I've listed
some example IP addresses below (prefixed with a count of the number of
requests yesterday):
10 135.232.19.31
9 135.232.19.35
9 135.232.19.38
7 135.232.20.103
10 135.232.20.104
12 135.232.20.12
19 135.232.20.13
20 135.232.20.2
6 135.232.20.203
18 135.232.20.35
20 135.232.20.41
20 135.232.20.45
15 135.232.20.49
11 135.232.20.5
Any thoughts welcome,
Andy
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