It appears that Michael Peddemors via mailop <[email protected]> said:
>Once again, a sampling of IPs would help confirm this..
>
>Also, are they using full email address or user name only for the 
>authentication attack.

It doesn't log the usernames.  I suppose I could do that.

>How many from each IP? 32? or just one or two?

Just one or two.

>So many bots, and so many open proxies, and still a huge number of 
>compromises CPE equipment, IoT devices..

No kidding.

>Need more information.. I assume that you have country authentication 
>controls, given the size of your server.. are they all US based?

No, they're all over the world.

>Give a couple of examples, including the EHLO that they are sending.. 
>can can give more informed information..

It's not logging the EHLO or AUTH but that's not too hard

R's,
John
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