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How is hard bounce - category 2 determined?

Question asked by ec7c17b9459aa9c04ed5a8b1f3423313e7be27fa on Nov 14, 2016
Latest reply on Nov 16, 2016 by josh.hill

Every month our team exports, archives, and deletes invalid leads from the database. This month we noticed a significant spike in invalid leads (jump from 2k to 20k leads). After looking in these more, we see a lot of leads were delivered/opened emails as recently as yesterday and are now invalid.


I know Marketo automatically marks a lead as hard bounce - category 2, if it receives a message from the receiving server that the email does not exist. However, it seems fishy that a lead was engaging in the last 24 hours and is now invalid.


Are there any other factors used to determine a category 2? Has anyone else experienced fishy invalid numbers? To avoid deleting good leads, is it possible to edit the filters before Marketo marks leads category 2 and in turn invalid?