> only 24 hours after setting it up on a brand new 
> ip address at port 587 I am already getting sasl auth brute force 
> attempts from about 15 different servers.

Did they all try to send a message or closed or dropped the connection
after your sofware accepted the password?

I'd be curious to look at those messages. I guess that most such messages
might be not actual spam, but a test message to check whether
the host+login+password combination would actually work for spamming.
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