I thought those characters looked like Base64...and it turns out, 
they are. I was able to extract enough from them to figure out the account.

At 06:36 PM 1/10/2010, Scott MacLean wrote:

>I have a user whose account is compromised and is being used to send
>spam through my server. However, I can't tell which account it is. In
>the ASSP log, I get a line like this:
>
>command list was 'EHLO,AUTH,ZQTxc4Tprs,LMCrgf,MAIL FROM,RCPT
>TO,DATA,QUIT' - used 10 SocketCalls
>
>Is there any way to decrypt or deduce from "ZQTxc4Tprs,LMCrgf" what
>the actual user is?
>
>
>
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