What is SCL 999?
999 is the SCL value assigned by IMF Tune to blacklisted emails. At the moment the Exchange Content Filter/IMF does not define an SCL for blacklisting. Thus we had to invent one. We chose a value that is much larger than the largest defined SCL. For this reason, whenever choosing to expose the SCL value, 999 will be set in case of blacklisted emails.
999 is the SCL value assigned by IMF Tune to blacklisted emails. At the moment the Exchange Content Filter/IMF does not define an SCL for blacklisting. Thus we had to invent one. We chose a value that is much larger than the largest defined SCL. For this reason, whenever choosing to expose the SCL value, 999 will be set in case of blacklisted emails.