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8.0

Can't delivery email due to 451 Timeout waiting for client input

Asked by paktung in SendMail Email Server

Tags: 451, timeout, waiting, client

Dear Expert,
   I don't know what cause our sendmail servers can't delvier email to some domains (Using hotmail / Yahoo mail can send and delvery). I try to monitor the mail log and always display "451 Timeout waiting for client input" this error message. Also, always wait a long long time until timeout and prompt the 451 error message.

   However, I try to use /usr/lib/sendmail -v xxx@xxx.com < test or telnet command to send the email. It is successfully delivered the mail.

   Our email servers mainly receive from external and relay internal mail to external one ( without open relay). So what I don't know what I do wrongly in the sendmail configuration.

   Please help to answer my question, many many thanks anyone attend this mail.

Log Info
220 xxx.xxx.xxx.xx Microsoft ESMTP MAIL Service, Version: 5.0.2195.6713 read
y at  Sat, 11 Oct 2003 18:38:09 +0800
>>> EHLO mailserver.xxx.xxx
250-mail.xxx.xxx.xxHello [xxx.xxx.xxx.xxx]
250-TURN
250-ATRN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250-X-EXPS GSSAPI NTLM LOGIN
250-X-EXPS=LOGIN
250-AUTH GSSAPI NTLM LOGIN
250-AUTH=LOGIN
250-X-LINK2STATE
250-XEXCH50
250 OK
>>> MAIL From:<xx.xx@xx.xxx.xx> SIZE=137592
250 2.1.0 xxx.xx@xxx.xx.xx....Sender OK
>>> RCPT To:<xxx@xxx.xxx.xxx>
>>> DATA
250 2.1.5 xx@xxx.xxx.xx
354 Start mail input; end with <CRLF>.<CRLF>

Then 451 timeout ...

Many Thanks for your professional advice
[+][-]10/11/03 08:35 AM, ID: 9532972Expert Comment

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[+][-]10/11/03 09:20 AM, ID: 9533115Expert Comment

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[+][-]10/11/03 10:36 AM, ID: 9533319Author Comment

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[+][-]10/11/03 06:32 PM, ID: 9534431Author Comment

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[+][-]10/11/03 07:35 PM, ID: 9534555Accepted Solution

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About this solution

Zone: SendMail Email Server
Tags: 451, timeout, waiting, client
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Solution Provided By: jlevie
Participating Experts: 1
Solution Grade: B
 
[+][-]10/14/03 11:10 PM, ID: 9552460Author Comment

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[+][-]10/15/03 01:50 AM, ID: 9553164Author Comment

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