Some time ago I ordered 1000 verified hotmail accounts and I have been using them to this day. All accounts that are already in project and in use, are working fine and email test is successful.
Accounts that I have not used yet, are failing test when I add them to a new project. Now the one that I logged in manually and saw everything is fine, is not failing the test anymore, but others are still giving the error: -ERR mailbox could not be opened.
Seems like I should log in to every mail account manually to get it work with Ser? (there was no message when i logged in manually, just empty inbox)