# on 29-Oct-2018 (Mon)

#### Flashcard 3510253784332

Question
In Linux, when email is received for you (from another user on the same machine or from a user from another machine) it is appended to the file: [...] /<username>
/var/spool/mail
^^ note that spool means a cylindrical device on which film/magnetic tape/other flexible materials can be wound

status measured difficulty not learned 37% [default] 0
10. Mail
m like Bruce Wallaby <bruce@kangeroo.co.au> or bruce@kangeroo.co.au (Bruce Wallaby) . In this case, the surrounding characters are purely cosmetic; only bruce@kangeroo.co.au is ever used. <span>When mail is received for you (from another user on the system or from a user from another system) it is appended to the file /var/spool/mail/<username> called the mail file or mailbox file; <username> is your login name. You then run some program that interprets your mail file, allowing you to browse the file as a sequence of mail messages and read a

#### Flashcard 3510257454348

Question
In linux, an email message is simply a [...] sent from one user to another, using some mail command or mailer program.
some text / a block of text

status measured difficulty not learned 37% [default] 0
10. Mail
here we show you how mail was first intended to be used on a multiuser system. To a large extent what applies here is really what is going on in the background of any system that supports mail. <span>A mail message is a block of text sent from one user to another, using some mail command or mailer program. A mail message will usually also be accompanied by a subject explaining what the mail is about. The idea of mail is that a message can be sent to someone even though he may not be logg

#### Flashcard 3510260600076

Question
In linux, an email message is simply a block of text sent from one user to another on the same machine or [...]
(across the internet to) another user on another machine

status measured difficulty not learned 37% [default] 0
10. Mail
here is really what is going on in the background of any system that supports mail. A mail message is a block of text sent from one user to another, using some mail command or mailer program. A <span>mail message will usually also be accompanied by a subject explaining what the mail is about. The idea of mail is that a message can be sent to someone even though he may not be logged in at the tim

#### Flashcard 3510263745804

Question
In linux, an email message is simply a block of text sent from one user to [...] or (across the internet to) another user on another machine
another on the same machine
​​​​​​​^^ this is how email was used mostly in the old days

status measured difficulty not learned 37% [default] 0
10. Mail
ed on a multiuser system. To a large extent what applies here is really what is going on in the background of any system that supports mail. A mail message is a block of text sent from one user <span>to another, using some mail command or mailer program. A mail message will usually also be accompanied by a subject explaining what the mail is about. The idea of mail is that a message can be sen

#### Flashcard 3510266891532

Question
In linux, email consists of a block of text, which is the email body, and some mail [...]

status measured difficulty not learned 37% [default] 0
10. Mail
space. Then comes the mail header, explaining where the message was routed from to get to your mailbox, who sent the message, where replies should go, the subject of the mail, and various other <span>mail header fields. Above, the header is longer than the mail messages. Examine the header carefully. The header ends with the first blank line. The message itself (or body) starts right after. The next h

#### Flashcard 3510270037260

Question
In linux, mail [...] are cli or gui tools that help you read the emails stored on the /var/spool/mail/<username> file (and these tools also can help send email, via SMTP protocal)
clients

status measured difficulty not learned 37% [default] 0
10. Mail
number, for example, delete 14 or reply 7 . The message number is the left column with an N next to it (for a N ew message). For the state of the art in terminal-based mail readers (also called <span>mail clients), try mutt and pine . [ pine 's license is not Free.] There are also some graphical mail readers in various stages of development. At the time I am writing this, I have been using balsa

#### Flashcard 3510273182988

Question
In linux, to send mail, you can use either a mail client or send directly via TELNET, both methods use the [...] protocol.
SMTP
^^^Simple Mail Transfer Protocal

status measured difficulty not learned 37% [default] 0
10. Mail
few months, which was the best mail reader I could find. 10.2 The SMTP Protocol -- Sending Mail Raw to Port 25 To send mail, you need not use a mail client at all. The mail client just follows <span>SMTP (Simple Mail Transfer Protocol), which you can type in from the keyboard. For example, you can send mail by telnet ing to port 25 of a machine that has an MTA (Mail Transfer Agent--also

#### Flashcard 3510276328716

Question
In Linux, you can send email by telnet ing to port [...] of a machine that has an MTA (Mail Transfer Agent--also called the mailer daemon or mail server) running
25

status measured difficulty not learned 37% [default] 0
10. Mail
Mail Raw to Port 25 To send mail, you need not use a mail client at all. The mail client just follows SMTP (Simple Mail Transfer Protocol), which you can type in from the keyboard. For example, <span>you can send mail by telnet ing to port 25 of a machine that has an MTA (Mail Transfer Agent--also called the mailer daemon or mail server) running. The word daemon denotes programs that run silently without user intervention. This is, in fact, how so-called anonymous mail or spam mail [Spam is a term used to indicate unsolicited e

#### Flashcard 3510279474444

Question
In Linux, you can send email by telnet ing to port 25 of a machine that has a [...] running
mail server / mail daemon

status measured difficulty not learned 37% [default] 0
10. Mail
in from the keyboard. For example, you can send mail by telnet ing to port 25 of a machine that has an MTA (Mail Transfer Agent--also called the mailer daemon or mail server) running. The word <span>daemon denotes programs that run silently without user intervention. This is, in fact, how so-called anonymous mail or spam mail [Spam is a term used to indicate unsolicited email--that is, ju

#### Flashcard 3510282620172

Question

In Linux, in the following Telnet snippet, what protocal is being used for the communication between the two servers/machines?

250 onion.cranzgot.co.za Hello cericon.ctn.cranzgot.co.za [192.168.3.9], pleased to meet yo
MAIL FROM:psheer@cranzgot.co.za
250 psheer@cranzgot.co.za... Sender ok
RCPT TO:mands@inetafrica.com
250 mands@inetafrica.com... Recipient ok
DATA
354 Enter mail, end with "." on a line by itself
Subject: just to say hi

hi there
heres a short message

.
250 OAA04620 Message accepted for delivery
QUIT
221 onion.cranzgot.co.za closing connection
Connection closed by foreign host.

HELO cericon.cranzgot.co.za

SMTP
^^^ Simple Mail Transfer Protocal

status measured difficulty not learned 37% [default] 0
10. Mail
con]# telnet mail.cranzgot.co.za 25 Trying 192.168.2.1... Connected to 192.168.2.1. Escape character is '^]'. 220 onion.cranzgot.co.za ESMTP Sendmail 8.9.3/8.9.3; Wed, 2 Feb 2000 14:54:47 +0200 <span>HELO cericon.cranzgot.co.za 250 onion.cranzgot.co.za Hello cericon.ctn.cranzgot.co.za [192.168.3.9], pleased to meet yo MAIL FROM:psheer@cranzgot.co.za 250 psheer@cranzgot.co.za... Sender ok RCPT TO:mands@inetafrica.com 250 mands@inetafrica.com... Recipient ok DATA 354 Enter mail, end with "." on a line by itself Subject: just to say hi hi there heres a short message . 250 OAA04620 Message accepted for delivery QUIT 221 onion.cranzgot.co.za closing connection Connection closed by foreign host. [root@cericon]# The above causes the message  hi there heres a short message '' to be delivered to mands@inetafrica.com (the R e C i P ien T ). Of course, I can enter any address that

#### Flashcard 3510285765900

Question
In Linux, often you cannot easily spoof email addresses via Telnet (using SMTP communcation protocal) as the [...] on the receiving machine has been configured to only accept message from specific trusted machines (or has been configured with similar security percautions).