Mail System Error - Returned Mail

This Message was undeliverable due to the following reason:

The user(s) account is disabled.

<kf4yyd_at_adelphia.net>

Please reply to Postmaster@<PostmasterDomain>
if you feel this message to be in error.

attached mail follows:

Dear user of adelphia.net,

We have found that your e-mail account was used to send a large amount of spam messages during this week.
We suspect that your computer had been infected and now contains a hidden proxy server.

Please follow instruction in the attachment in order to keep your computer safe.

Have a nice day,
The adelphia.net support team.