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How does email routing/queuing work?

By michael ·
If an email is sent to a domain that has more than one mx record, and the preferred email handler is down, what exactly happens to the message? Does it queue at the senders smtp server, or does it queue at the next server spec'd by the next mx record? What limits whose messages can be queued on an smtp server, specifically ms iis smtp server? Also, is a backup POP3 server possible?

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How does email routing/queuing work?

by MCSE Lee In reply to How does email routing/qu ...

If I remember correctly, it should queue at the next server. As far as backup POP3 Servers, I think MS Cluster Server will do the job.

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How does email routing/queuing work?

by michael In reply to How does email routing/qu ...
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How does email routing/queuing work?

by tcleeton In reply to How does email routing/qu ...

The e-mail messages are never queued on the smtp server, they are only sent from their and returned their if undeliverable. They are stored on the computer who has the second mx record when the first one is unavailable for a predetermined amount of time and then dumped, the user will get a message that says it was attempted to be sent x hours and was unreachable. I believe the default is 48 hours. Again messages are never queued at the smtp gateway, currently no m.s. solution exists for a backup pop 3 server.

Tracy

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How does email routing/queuing work?

by michael In reply to How does email routing/qu ...
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