If a user attempts to perform a Search with two Contact at the same time, query won't return any results.
The case is: User A is searching in his/her mailbox for mails sent by Contact B in which Contact C was also copied (either, CC or To).
When using two contacts with these two different conditions. there are no results for such search.
This is a really common search made by users, that was possible in Gmail, and now that they have migrated to Domino/Verse, can't continue using.
I'm guessing that the feature "Sent" is meant to only look for mails in the Sent folder of current user, but our users really perform with a lot of frequency such search.
As a reference, in Notes Client you can indeed specify 2 or more contacts / email addresses and it will perform the search for mails which contains all of such contacts.
We tested it on Verse 2.0.1 over Domino 11.0.1 FP2 on RHEL We tested it on Verse 2.1.0 over Domino 11.0.1 FP3 on RHEL We tested it on Verse 2.1.0 over Domino 12.0 Beta 3 on RHEL with the exact same results.