This is the Symantec Mail Security program at host mbug18.uni-graz.at.

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# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
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Your message could not be delivered for 4.0 hours.
It will be retried until it is 5.0 days old.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

			The Symantec Mail Security program

<peter.kroisel@meduni-graz.at>: delivery temporarily suspended: connect to
    mbug28.uni-graz.at[143.50.5.28]: Connection timed out