Email services
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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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Email Services

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Email services

Email Services


Components of an email system

Components of an Email System


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

    • Accepts mail via hostname

    • mail [email protected]

  • Domain Mail Service

    • Provides mailboxes for any users in domain

    • mail [email protected]


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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