Hello,

Rolf Kutz wrote:

emails because of obviously nonexistent envelope addresses, that doesn't count those systems where we don't accept mail from *at all* because they are dialup systems. This, however, is a small system with 10 email

How do you define dialup systems and tell dialup
systems from other systems?

There is a database where ISPs can register the ranges they assign for dialup users.

   Simon

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