I have seen bounces from bogus sender addresses before. The volume on this occasion was greater by a factor of around 100 times. The bounces stopped (dramatically slowed) when I disabled sending from my SMEServer.
So the bounces didn't stop.
The frequency with which you receive bounce messages will vary depending on how frequently spammers are forging your user's addresses as sending addresses, if that is what is happening.
Receiving bounce messages is not evidence that your system sent spam, unless the messages themselves contain evidence that your system actually handled them.
Should I open a new bug?
Of course.
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