I came across this issue last week when upgrading a customer from Domino 9 to R11.0.1FP3. I was finishing the upgrade by performing an offline (Domino server stopped) ODS upgrade on a large number of files using compact -c -upgrade over a .ind file that contained all files that were still on an older ODS.

These are some really useful notes.ini variables, if you’re changing any SMTP settings in Domino (in particular if you’re setting up or changing a TLS connection).