mail Flashcards

not fail exam 2

1
Q

What protocol does mail use to send messages?

A

SMTP

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2
Q

What is a MTA?

A

Message transfer agent

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3
Q

How do emails get to their destination?

A

Routing through multiple MTAs

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4
Q

What is a UA?

A

Application that allows users to do stuff with emails

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5
Q

What are the two types of UAs?

A

Local and remote

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6
Q

What is a remote UA?

A

UA is an application on a device (laptop) that uses SMTP to send messages, and IMAP or POP3 to read messages.

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7
Q

When is authentication done for remote UAs?

A

Before mail is retrieved.

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8
Q

What is a local UA?

A

When the UA is the same computer as the MTA.

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9
Q

When is authentication done with local UAs?

A

With login

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10
Q

What is MIME?

A

Multipurpose Internet Mail Extensions

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11
Q

What is MIME used for?

A

UAs use it to display messages. Can display images, audio, even encrypt stuff! Basically makes emails more fun :) and wayyyyyy more sketch…

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12
Q

What do MTAs add to message headers?

A

Date/time
Email address
IP address

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13
Q

What is SMTP used for?

A

Usually clients sending commands across a server

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14
Q

What does the SMTP command HELO do?

A

Introduces yourself

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15
Q

What does the SMTP command EHLO do?

A

Requests extended mode and does what HELO does

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16
Q

What does the SMTP command MAIL FROM do?

A

Specifies the sender

17
Q

What does the SMTP command RCPT TO do?

A

Specifies the recipient

18
Q

What does the SMTP command DATA do?

A

Specifies the body of the message

19
Q

What does the SMTP command RSET do?

20
Q

What does the SMTP command QUIT do?

21
Q

What does the SMTP command HELP do?

A

Gets help about the session

22
Q

What does the SMTP command VRFY do?

A

Verifies an address for you

23
Q

What does the SMTP command EXPN do?

A

Expands an address

24
Q

What does the SMTP command VERB do?

A

Verbose mode (more output probably)

25
What is POP3 used for?
Downloading email messages. Not great for multiple locations accessing it at the same time though.
26
What is IMAP used for?
Access messages (without removing them from the server usually). Usually fine with multiple locations.
27
What is a Sender Policy Framework (SPF)
Specifies who can send mail from the domain.
28
What is Domain Keys Identified Mail (DKIM)?
A way to detect mail spoofing.
29
Which ports are plaintext? | 23, 25, 110, 993, 143, 587, 995
23, 25, 110, 143
30
What does STARTTLS do?
Tries to make insecure connections more secure. Doesn't encrypt it end-to-end though...