Mailbox once once the message is downloaded the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ssage store. mailbox Once Once the message is downloaded the message is deleted from the server. deleted May May be configured to leave a copy of the messages on the server messages POP3 Telnet Session POP3 To read your email (for free, anywhere in the world, and with only telnet): telnet < 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 useful here) useful dele <messagenumber> (mark message for deletion) last (to get the last message number; useful for the forgetful who receive lots of email) email) quit (delete messages marked for deletion and end session) Email Client Security Email Most Most mailbox protocols were originally plaintext with no security precautions plaintext Each protocol (POP3, IMAP4) etc. have Each been amended several times to increase security security Secure authentication added. RFC 2595 Adds 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 Can download what you want download Can display and use multiple folders on Can the server the Primarily used when you want mail to Primarily remain on server. remain HTTP HTTP Many 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) (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 world GDP) GDP) US $170 per mailbox per year US 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 spam Email advertising $1.4 Bill...
View Full Document

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.

Ask a homework question - tutors are online