Post #4232864
2026-07-01 18:22 UTC
@TobiasFrech@ijug.social I’m curious about your ip space. Are you using a cloud provider or your own allocation?
I haven’t bothered in a decade, but at that time both ms & google were intermittently blocking fully compliant (fw/rev dns, spf, dkim, dmarc) for no apparent reason - it was source address, most cloud providers were on the block list.
Most egregiously, they’d accept it at the ingress and drop it somewhere else in the chain without the recipient/sender ever knowing.
With the tracing in 365/gmail now, that practice may have changed.
Replies (1)
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@TobiasFrech@ijug.social 2026-07-01 19:01
@vince@infosec.exchange it's not a private IP space. Just a regular IP the cloud provider uses for their VMs. The IP is specific to our VM. We once had to request it to be removed from a block list. But that only happened once in three years.