Get-Recipient | Select Name -ExpandProperty EmailAddresses | Select Name, SmtpAddress | Export-csv c:\AllEmailAddress.csv
With the following command you can disable the automapping on a usermailbox.
Add-MailboxPermission -Identity TARGET -User 'FULL NAME' -AccessRight FullAccess -InheritanceType All -Automapping $false
TARGET = Target AD account
FULL NAME = The name of the user that is granted full access to the mailbox.