Last night’s maintenance window of our spam filter upgrade completed at 9:00pm ET.
Unfortunately, the upgrade introduced an unforeseen issue that affected some mailmaps causing messages to bounce back to the sender.
We identified the issue at around 12:30am ET (but likely affected messages beforehand), and was resolved before 3:00am ET.
We apologize for any inconvenience this may have caused.
If you have any questions, please reach out to our support team.
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