On the off chance that more data helps, here are my findings (with only
recipient domains censored) based on a log audit of those "senders."
Logs: https://clbin.com/RKWkN
Considering that everything before the @ looks to be generated by an
algorithm, it should be sufficiently redacted but still might offer
further insight into the algorithm itself.
On 2023-03-11 05:57, Peter N. M. Hansteen via mailop wrote:
Hi,
Since some time yesterday I've seen a largish number of delivery
attempts to
obviously generated, invalid addesses in some of our domains, with the
following
apparent senders:
informat...@ckuser.com
informat...@mbxchk.com
informat...@reqck.com
informat...@send-now.net
informat...@usereml.com
informat...@uservfy.com
informat...@validmbx.com
I assume this is yet another round of somebody selling a SMTP callback
setup much like the morons described in this piece -
https://bsdly.blogspot.com/2017/08/twenty-plus-years-on-smtp-callbacks-are.html
but before I publish any further rants I would kind of like to hear
what
the think they're doing.
So does anybody here have useful conact information for one or more of
the
domains listed? I assume trying the RFC2142 addresses will be a waste
of time.
All the best,
Peter
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