Common Service Information

Question 1

What is another word for an SMTP client? (software)

Answer 1

MUA (Mail User Agent)

Question 2

What is another word for an SMTP server? (software)

Answer 2

MTA (Mail Transfer Agent)

Question 3

Whats another word for an SMTP relay server?

Answer 3

MSA (Mail Submission Agent)

Question 4

Whats another word for the recipient mail server?

Answer 4

Mail delivery agent (MDA)

Question 5

Describe the path of an email being sent

Answer 5

Client (MUA) ➞ Submission Agent (MSA) ➞ Open Relay (MTA) ➞ Mail Delivery Agent (MDA) ➞ Mailbox (POP3/IMAP)

Question 6

How can you interact with an SMTP server?

Answer 6

telnet

Question 7

How can you enumerate users on a system with SMTP?

Answer 7

VRFY command

Question 8

How does a mail server check that a mail from bob@example.com has originated from example.com’s mail server?

Answer 8

It checks the SPF record for example.com and compares the originating IP from the email with the ips listed in the SPF record for example.com

Question 9

Whats an IMAP configuration setting that enables debug loggin?

Answer 9

auth_debug

Question 10

Whats an IMAP configuration setting that logs all submitted passwords?

Answer 10

auth_debug_passwords

Question 11

Whats an IMAP configuration setting that logs unsuccessful authentication attempts and their reasons?

Answer 11

auth_verbose

Question 12

Whats an IMAP configuration setting that logs and truncates passwords used to authenticate?

Answer 12

auth_verbose_passwords

Question 13

Whats an IMAP configuration setting that specifies the username to be used when logging in with the ANONYMOUS SASL mechanism?

Answer 13

auth_anonymous_username