Formal Tests

don't rely on the content.

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

SPF

SPF

Does the email really come from an authorised server?

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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