>After all that, I *do* have a question.  How can I tell by looking at my 
>log file that my server was indeed used for relay spamming?

big picture:

log file could be x times bigger that previous daily averages.

close-up:

In SMTPD lines, look for a "connect" from an non-trusted ip, with no SMTP 
AUTH, and "RCTP TO: recipient@recipientdomain" where recipientdomain is not 
local.

Len


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