Unformatted text preview: ssage store.
Once the message is downloaded the message is
deleted from the server.
May be configured to leave a copy of the
messages on the server
messages POP3 Telnet Session
To read your email (for free, anywhere in the world, and with only telnet):
telnet <mail.yourISP.net 110> (wait for connect message)
user <yourusername> (wait for confirmation)
pass <yourpassword> (wait for confirmation)
list (to view the number of messages)
retr <messagenumber> (to read the message; FreeBSD's scroll buffer is very
dele <messagenumber> (mark message for deletion)
last (to get the last message number; useful for the forgetful who receive lots of
quit (delete messages marked for deletion and end session) Email Client Security
Most mailbox protocols were originally
plaintext with no security precautions
plaintext Each protocol (POP3, IMAP4) etc. have
been amended several times to increase
security Secure authentication added. RFC 2595
Adds TLS with IMAP, POP3 and ACAP
(Application Configuration Access Protocol )
pplication onfiguration ccess IMAP
IMAP Latest version is IMAP4 On port 143 or 220 Can view just the header and then
download what you want
download Can display and use multiple folders on
the Primarily used when you want mail to
remain on server.
Many mail servers have an HTTP
interface to the email system.
interface No standard Gmail Windows Live email (AKA Hotmail) Exchange Outlook Web Access Etc. SPAM!
SPAM! Unsolicited Commercial Email
(SPAM) Email that is received unsolicited Typically advertising products
Majority medication, financing etc Spam Stats world cost $50 billion in 2005, us firms $17 billion (.17 of US
US $170 per mailbox per year
Doing nothing costs $718 per mailbox per year
AOL's spam filters block over 1.5 billion messages a day
spam is estimated to be 80-90+% of all email
Email advertising $1.4 Bill...
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This note was uploaded on 12/03/2012 for the course I SYS 404 taught by Professor Meservy during the Fall '12 term at BYU.
- Fall '12