Question about MX record.

[HeePok Lee]

Hi all!

I set the domain name on my DNS like below.

.
.
mediacity.co.kr.     IN     MX  10 mail.mediacity.co.kr.
mediacity.co.kr.     IN     A     210.105.60.68
                            IN    MX       90 mediacity.co.kr.
mail              IN      A        164.124.107.29
www             IN      CNAME    mediacity.co.kr.


Mail server is running on both servers(210.105.60.68 and 164.124.107.29).
By the way, when I send a mail to ID at mediacity.co.kr,
sometimes mail is lost.
To where mail is going?
Could you explain why mail is lost?
Thank you!!!





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