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For example, let's say my MX Record(s) specify:

0 server1

1 server2

Now let's say: is an account on server1

and is an account on server2

Will the sender try to send mail on server1 and fail over to server2?

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closed as off-topic by Iain, mdpc, Ward, Mathias R. Jessen, Tim Brigham Jan 13 '14 at 18:13

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No it won't. If you want to do this you'll need to set up SMTP namespace sharing. – joeqwerty Jan 10 '14 at 21:33
Anyone care to explain the down vote ? – SMTF Jan 11 '14 at 0:58
Mouseover the arrow: "this question does not show any research effort; it is unclear or not useful". – MadHatter Jan 11 '14 at 7:57
up vote 3 down vote accepted

No, the values at the start of your records are MX preference values. Preference values are used to advise servers wishing to deliver mail to which is the preferred host to deliver to. The lower the value the more preferred the host is.

In your example mail will only be delivered to server2 if server 1 is unavailable.

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No. If you need to do this you will need a mail-aware application running on :25 on the servers that are the targets for the MX records that can sort out where to deliver or forward the mail to.

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fyi, MX record is for INCOMING mails and not for outgoing, you might want to spend some time reading more into it so that you'll understand it better: MX record - Wikipedia, the free encyclopedia

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