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What is the role of mta?

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Anonymous

13y ago
Updated: 8/17/2019

A Mail Transfer Agent (MTA) is responsible for getting a mail message from the sender's host machine to the recipient's host machine. These "host machines" are where the mail resides, and they are probably not the users' personal machines. For example, if you have a gmail account then the host machine is one of Google's servers.

Typical stages are

  1. The Mail User Agent (MUA), aka "mail reader," sends the message to the local MTA
  2. The MTA figures out the recipient's host and sends the message to that host's MTA
  3. On the recipient's host the MTA passes the message to the Message Delivery Agent (MDA) which put the message in the recipient's inbox
  4. The recipient uses an MUA to read the message

The reason for the seeming complexity is that there can be a lot of variability at each step along the way. For example, the MUA may choose different MTAs depending on the recipient list. An MTA may receive a message addressed to "user@bigcorp.com" and send it on to an internal host that handles mail for that user. The MDA is dependent on the local POP or IMAP server being used. And the user may choose different mail readers.

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Wiki User

13y ago

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