genesisIT
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mail queueing up with error smtp error 451
Hi we have a SBS 2003 with Exchange 2003 and all of a sudden mail will not send, first i noticed the error (The connection was dropped due to an SMTP protocol event sink) when looking at the queues in exchange manager.
So i enables smtp logging and this error was logged in event viewer.
Event Type: Warning
Event Source: MSExchangeTransport
Event Category: SMTP Protocol
Event ID: 7002
Date: 11/30/2006
Time: 8:37:53 PM
User: N/A
Computer: SERVER
Description:
This is an SMTP protocol warning log for virtual server ID 1, connection #77. The remote host "xxx.xxx.xxx.xxx", responded to the SMTP command "rcpt" with "451 Temporary local problem - please try later ". The full command sent was "RCPT TO:<mail@mydomain.co.uk> ". This may cause the connection to fail.
For more information, click http://www.microsoft.com/contentredirect.asp.
So i tried to connect to my isp's smtp mail server via telnet and got this error
MAIL FROM:mark@customersdomain.
250 OK
RCPT TO:mark@mydomain.co.uk
500 unrecognized command
RCPT TO:mark@myotherdomain.co.u
500 unrecognized command
RCPT TO:Mark@mydomain.co.uk
500-unrecognized command
500 Too many syntax or protocol errors
Connection to host lost.
any help would be appreciated
Mark
So i enables smtp logging and this error was logged in event viewer.
Event Type: Warning
Event Source: MSExchangeTransport
Event Category: SMTP Protocol
Event ID: 7002
Date: 11/30/2006
Time: 8:37:53 PM
User: N/A
Computer: SERVER
Description:
This is an SMTP protocol warning log for virtual server ID 1, connection #77. The remote host "xxx.xxx.xxx.xxx", responded to the SMTP command "rcpt" with "451 Temporary local problem - please try later ". The full command sent was "RCPT TO:<mail@mydomain.co.uk> ". This may cause the connection to fail.
For more information, click http://www.microsoft.com/contentredirect.asp.
So i tried to connect to my isp's smtp mail server via telnet and got this error
MAIL FROM:mark@customersdomain.
250 OK
RCPT TO:mark@mydomain.co.uk
500 unrecognized command
RCPT TO:mark@myotherdomain.co.u
500 unrecognized command
RCPT TO:Mark@mydomain.co.uk
500-unrecognized command
500 Too many syntax or protocol errors
Connection to host lost.
any help would be appreciated
Mark
ASKER
It's not the isp because i have many other customers using the same isp including myself and they are all fine it is just this one site that has a problem.
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You could try switching your email to deliver by DNS, you will probably find most email will be delivered, even if you are on a dynamic IP address. Some will fail and you will have to sit on those until the ISP has fixed their problem.
Simon.