[求助] 關於信件會遺失和收不到的問題？

[yungke22]

最近把舊的mail server 給他硬體升級，順便把MAILD升到1910.V，發現會有部份信件會收不到也既不出去。
網域：gtour.ebiz.tw
IP 61.30.120.66
這是在台固申請的，他沒有MX的服務(傷腦筋)，這是不是影響寄信收信的原因阿。

一些被退信的訊息：
Response message:
To: [email protected]
Subject: ttt
Reason: Timeout for attempting to re-send in 20 times.
Remote host: gtour2.com
Details: 451 Temporary local problem - please try later


Response Message :
To: [email protected]
Subject: tyryrty
Reason: 554 delivery error: dd This user doesn't have a yahoo.com.tw account ([email protected]) [-5] - mta157.mail.tpe.yahoo.com
Remote host: 202.43.200.98

[Arnor]

[yungke22]

感恩，

我懂了，真的要把DNS架設起來了設MX，還好有你們有DNSD，不然在WIN2000架DNS，我會想哭..............

[Liang]