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Email Services. Components of an Email System. Order of Scale. Single Server ( default configuration ) Provides mail boxes for local users only Inbound mail from localhost only mail jimg LAN Network Accepts mail via hostname mail [email protected] Domain Mail Service

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Presentation Transcript
order of scale
Order of Scale
  • Single Server (default configuration)
    • Provides mail boxes for local users only
    • Inbound mail from localhost only
    • mail jimg
  • LAN Network
  • Domain Mail Service
logical mail agents
Logical Mail Agents
  • Mail User Agents (MUA)
  • Mait Transport Agents (MTA)
  • Mail Delivery Agents (MDA)
  • Mail Retrieval Agents (MRA)
mail user agents
Mail User Agents
  • Send mail by talking to an MTA using smtp.
  • Receive mail usually through communication with an MRA such as pop3 or imap.
  • Examples:
    • UNIX mail command
    • Evolution
    • Pine, Elm, Mutt
    • Outlook
mail transfer agents
Mail Transfer Agents
  • Process the mail into ‘envelopes’
  • Relay the mail to other MTAs until the destination is reached.
  • Examples:
    • sendmail
    • postfix
    • qmail
    • Smail
    • MMDF
mail delivery agents
Mail Delivery Agents
  • Also called Local Delivery Agents
  • Take the mail from the MTA and deposits in local mailboxes:
    • mbox – single file format
    • maildir – directory of mail messages
  • Examples:
    • procmail
    • maildrop
mail receiving agents
Mail Receiving Agents
  • Download mail to client machines
  • Require authentication to mail server
  • POP3 – Post office protocol
    • plain text authentication
    • downloads entire mailbox to client
    • allows only downloads, not uploads
  • IMAP – Intenet Message Access Protocol
    • allows two-way transmission
    • supports multiple mail folders
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