Yep. I had this a few weeks ago. Got an automated email with the ticket ID. I didn't hear anything for a few hours, so I went back into my account in the web portal and the ticket was just .... gone! When I raised a new ticket referencing the old ticket ID, I got the same response posted here - spam filter. Eh?
If this is happening regularly, I would suggest some sort of alert be setup, so when a case is moved to spam, someone is notified about it for manual intervention - at least glean the name of the customer on the case so you can alert them of what's happened, rather than leaving the customer in the dark for hours/days until they realise. It doesn't look good if your customers are the ones telling you your systems are broke.
Zach Raven
Anyone else having there support tickets disappearing? I've sent like 3 and they sit there for an hour and then disappear.