Formal Tests

don't rely on the content.

First of all we use Nolisting (aka "Poor Man's Greylisting").

Is the Recipient a Valid Email Address?

  • All valid email addresses at TU Graz have to be registered via TUGonline
  • All valid email servers have to be reported
So the mailgates have to deal (spam, malware) only with emails for valid recipients.

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Diagram

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Size of Email

If size is bigger than maximal size we reject the email.

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