You have received a non delivery notification (bounce mail) which references this page.
The SPAM flagging mechanism of the Vienna University of Technology scored your mail equal or above the recipients individual limit which denied further transport of the e-mail.
In case this mail was indeed not a SPAM e-mail you may insert the word "NoTuSpam" (case sensitive!) into the subject and resend the e-mail. This should prevent the reject situation again.
In addition you may help us by sending this e-mail to the mail administration (to "mailadmin AT tuwien DOT ac DOT at") adding the word "NoTuSpam" to the subject, too. We are trying improve our rule base to prevent situations like this one.