各位大大們好:
請教一下有些特定公司寄mail過來總是到傳送資料時斷線

以下是smtp log

Thu 2018-10-18 12:47:28: <-- MAIL From:aa@XXX.com.tw SIZE=37638
Thu 2018-10-18 12:47:28: Performing IP lookup (econcord.com.tw)
Thu 2018-10-18 12:47:28: * P=010 S=000 D=XXX.com.tw TTL=(5) MX=[mta1.XXX.com.tw]
Thu 2018-10-18 12:47:28: * P=010 S=001 D=XXX.com.tw TTL=(5) MX=[mta2.XXX.com.tw]
Thu 2018-10-18 12:47:28: ---- End IP lookup results
Thu 2018-10-18 12:47:28: --> 250 aa@XXX.com.tw, Sender ok
Thu 2018-10-18 12:47:28: <-- RCPT To:bb@YYY.com.tw
Thu 2018-10-18 12:47:28: --> 250 bb@YYY.com.tw, Recipient ok
Thu 2018-10-18 12:47:28: <-- RCPT To:cc@YYY.com.tw
Thu 2018-10-18 12:47:28: --> 250 cc@YYY.com.tw, Recipient ok
Thu 2018-10-18 12:47:28: <-- DATA
Thu 2018-10-18 12:47:28: Creating temp file (SMTP): d:\mdaemon\queues\temp\md50000004638.tmp
Thu 2018-10-18 12:47:28: --> 354 Enter mail, end with .
Thu 2018-10-18 12:47:28: Connection closed
Thu 2018-10-18 12:47:28: SMTP session terminated (Bytes in/out: 17305/3967)

在create temp file後 馬上連線中斷
麻煩各位高手幫忙解惑,如何將問題解決排除 感激不盡