>
> From there you can start looking for directories related to
> these accounts
> or at least change to stronger passwords
>
Also look for directories with CHMOD 777. On my previous comment I wondered why the access_log didn't show the same time stamp as the maillog. It just occured to me that with a large spam run the mail would be in mailq so the timestamp would be different. You might grep for that domain with /*.cgi or just look for .cgi or .pl scripts owned by that user. Or any executable file owned by that user.
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Dan Kriwitsky