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how is email delivery work from one MTA to other MTA?

Posted on 2008-10-26
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Hi,
I need to understand the emails delivery from one MTA to other and what is the concept of Relay on MX record?
Please help with examples.
Thanks
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Question by:samengr
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hfraser earned 125 total points
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Email MTAs that you're referring to use SMTP (Simple Mail Transfer Protocol) to exchange messages that have been queued up for delivery. Messages are then processed and stored in some kind f postoffice repository until they're retrieved by a user.

MTAs basically have 3 options when they receive a message for delivery:

1. The destination domain name can be resolved in DNS and a connection successfully made to the SMTP on the server. The message is delivered.
2. The destination domain name can br resolved in DNS but a connection cannot be made to the SMTP port on the server. The message cannot be delivered, but will be re-tried for 3 days
3. The destination domain name can't be resolved. A non-delivery maessage is sent back to the sender.

MX records are used to identify a server that is used to receive mail. It's simply a way to identify the target for an address like user@company.com, It may be a specific server owned by he company, like mail.company.com. Or it could be a hosted email service. In any event, the name identified in an email address is still "company.com".
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by:samengr
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Thanks dear.
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