[Bro] Connection UID repeat itself

[Dave Angelo]

Hey,

I registered on the SMTP::mime_end_entity event to inspect some SMTP
traffic.

I am printing the '*c$smtp$uid*' to a log file and I noticed that once in a
while the UID repeats itself.

I started debugging this and I noticed that a certain email X that was sent
5 times to 5 different recipient had the *same* UID.

I was looking at *calculate_unique_id() *that generates this UID and I
cannot understand why this happens.

Why all those specific emails have the same UID?

Thanks,
Dave
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