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STMP Error
I have a user that sent an email and got the following response:
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
#< #5.0.0 X-Postfix; host smtp801.microsoftonline.co
Assuming the email address is valid, what is the problem, and what setting do I change from exchange 2007 management console?
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
#< #5.0.0 X-Postfix; host smtp801.microsoftonline.co
Assuming the email address is valid, what is the problem, and what setting do I change from exchange 2007 management console?
Asked:
3-
3
2- +1
2 Solutions
The Recipent Email Address doesnt Exist. "5.1.1 User unknown"
The server you have contacted as the desternation is not accepting the email as you are trying to send to an address that it cannot route or deliver too.
If 100% sure the address is correct then the Postfix server is probably using this message as a denial message due to some other reason such as the sender has been tagged as spam or has been blacklisted;
Check the domains at mxtoolbox.com
The server you have contacted as the desternation is not accepting the email as you are trying to send to an address that it cannot route or deliver too.
If 100% sure the address is correct then the Postfix server is probably using this message as a denial message due to some other reason such as the sender has been tagged as spam or has been blacklisted;
Check the domains at mxtoolbox.com
www.mxtoolbox.com
This website had a blacklist checker, you can then contact the seperate companys listed that have you blacklisted and request removal if you are confidant that you are not sending spam email from your site, i.e. a virus or mail bot on you internal network or exchange server
This website had a blacklist checker, you can then contact the seperate companys listed that have you blacklisted and request removal if you are confidant that you are not sending spam email from your site, i.e. a virus or mail bot on you internal network or exchange server
According to www.mxtoolbox.com blacklist checker we are fine with the exception of some timeouts on the last three
CYBERLOGIC TIMEOUT ERROR, Reponse code=2 0
EMAILBASURA TIMEOUT 0
SPAMRBL TIMEOUT 0
CYBERLOGIC TIMEOUT ERROR, Reponse code=2 0
EMAILBASURA TIMEOUT 0
SPAMRBL TIMEOUT 0
To Check SpamRBL lists try this site;
http://www.anti-abuse.org/multi-rbl-check/
Blacklisting is only one option.
My next question would be;
Can you email anyone at the desternation company? or are you only having problems sending to this one user.
Can they (the destination company) send to you or your users without any problems, I would then try to reply to one of thier emails so the correct email address is used.
http://www.anti-abuse.org/multi-rbl-check/
Blacklisting is only one option.
My next question would be;
Can you email anyone at the desternation company? or are you only having problems sending to this one user.
Can they (the destination company) send to you or your users without any problems, I would then try to reply to one of thier emails so the correct email address is used.
Where on earth did Blacklists come into the equation when the error is Unknown User?
That is a complete Red Herring and should be ignored.
That is a complete Red Herring and should be ignored.
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Another alternative is the servers at their end are clustered and you managed to find the one node in the cluster that doesn't have this particular user configured on it.
Alan