Which two FortiMail features can the administrator configure to tackle this issue?

An administrator sees that an excessive amount of storage space on a FortiMail device is being used up by quarantine accounts for invalid users. The FortiMail is operating in transparent mode.

Which two FortiMail features can the administrator configure to tackle this issue? (Choose two.)
A . Automatic removal of quarantine accounts
B. Recipient address verification
C. Bounce address tag verification
D. Sender address rate control

Answer: A,D

Explanation:

Reference:

https://fortinetweb.s3.amazonaws.com/docs.fortinet.com/v2/attachments/9aa62d26-858d-11ea-9384-00505692583a/FortiMail-6.4.0-Administration_Guide.pdf (322, 323)