Which two ESMTP commands are supported by the ASA inspection engine? (Choose
two.)

A.
SOML

B.
LINK

C.
VERB

D.
ONEX

E.
ETRN

F.
ATRN

Explanation:
ESMTP is an enhancement to the SMTP protocol and is similar is most respects to SMTP.
For convenience, the term SMTP is used in this document to refer to both SMTP and
ESMTP. The application inspection process for extended SMTP is similar to SMTP
application inspection and includes support for SMTP sessions. Most commands used in
an extended SMTP session are the same as those used in an SMTP session but an ESMTPsession is considerably faster and offers more options related to reliability and security,
such as delivery status notification.
Extended SMTP application inspection adds support for these extended SMTP
commands, including AUTH, EHLO, ETRN, HELP, SAML, SEND, SOML, STARTTLS, and
VRFY. Along with the support for seven RFC 821 commands (DATA, HELO, MAIL, NOOP,
QUIT, RCPT, RSET), the ASA supports a total of fifteen SMTP commands.
http://www.cisco.com/c/en/us/td/docs/security/asa/asa-commandreference/I-R/cmdref2/i2.html#pgfId-1765148