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Re:Zoho.com CEO says domain with 40M users suspended for abu... by lathiat on Tuesday September 25, 2018 @04:49AM (#18064582)
If I had to guess they're probably rejecting the message further because it likely contains the spam itself.

This is a key error in their handling of their abuse@ address, it needs to be expected to receive spam.

Re:Zoho.com CEO says domain with 40M users suspended for abu... by onli on Tuesday September 25, 2018 @05:33AM (#18064757)
But if the diagnostic code were correct and it were just a grey listing, that would be okay, wouldn't it? Just clashes with the mentioned five days.