Employees of a company are facing lots of bounced email notifications from email addresses they have never sent messages to. Select the options below which are correct for the given scenario.
(Select all acceptable answers.)
Mail boxes of the company users are full, resulting in bounced emails.
Company email addresses seem to have been spoofed and used for spamming.
An email authentication method like DKIM can be used to prevent such incidents.
SMTP would prevent such incidents as emails can be sent reliably using it.
Having more than one email server would reduce such email bouncing incidents.