Priority of MX record

Fri Dec 23 04:46:11 UTC 2005

Hello,

    Say we have a domain name of abc.com. The DNS entries are as
the following.

abc.com MX 10 mail.abc.com
abc.com MX 20 mail2.abc.com

    This morning, we find that our internet connection of mail.abc.com
is not working. But while mail2.abc.com works normally, it seems we're
still not getting any emails. So finally I have to switch the priority
of them to make it work.

Aren't the "priority" of a MX record be used as a fallback when one
mail host is inaccessable? Or do I have some misunderstanding on this
matter?

    Please advise. Thanks.

Regards,
Lau Lei Cheong
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