Saw this old post and just wanted to chime in, though it looks like the problem got solved. I had a similar situation where random test emails were spamming my inbox because of some dev team's testing. It was super frustrating at the time! I ended up cleaning my own email list with https://bulkemailchecker.com/ to make sure no invalid emails were mixed in, which helped in the long run. Hopefully, everything got straightened out on your end before you had to block anything from Pandora.
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