How to grant logon permissions to the newly created Exchange 2010 mailboxes for QMM service account (4264029)

It has been observerd that in some environments the cmdlets suggested by QMM documentation do not allow the service account to log on to any newly created Exchange 2010 mailboxes. That is, the cmdlets grant enough permissions to log on to the mailboxes existing in the database, however, when a new mailbox is created by the MMEX Directory Synchronization Agent (or manually, if this is the source database), the service account cannot log on to it and requires applying Send as and Receive as permissions explicitly.