Which three statements about SMTPS and SMTP over TLS are true? (Choose three.)

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.)

Which of the following statements are true regarding FortiMail's behavior when using the built-in MTA to process email in transparent mode? (Choose two.)

A FortiMail is configured with the protected domain example.com.
On this FortiMail, which two envelope addresses are considered incoming? (Choose two.)

Refer to the exhibit.

MTA-1 is delivering an email intended for User 1 to MTA-2.
Which two statements about protocol usage between the devices are true? (Choose two.)