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Error sending outbound emails from single email address
I have one email address that cannot send email to external email addresses. I get no errors when sending them but when I run the troubleshooting assistant on the Exchange server I get the following error. Mail submission failed: Error message: Syntax error, command unrecognized. The server response was: 5.3.3 Unrecognized command. I cannot find anything different with this email account than with any of our other accounts that work just fine.
matrix8086
Check to see if you are not running out of disk space on server or user PC
ASKER
I have plenty of space both on the Exchange Server and on the PC I am testing from.
Check the firewall for open ports that your Exchange uses to send email
No other ideas ... :(
No other ideas ... :(
ASKER
I don't think it would be the firewall or it would not be working for anybody, not just this account.
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Hi,
Check on HUB Transport server is there any rule set for the specific user, in my case we found some rules was created earlier because there was spam incident from that account.
it is not so technical but happen some times.
thanks,
MB Shaikh.
Check on HUB Transport server is there any rule set for the specific user, in my case we found some rules was created earlier because there was spam incident from that account.
it is not so technical but happen some times.
thanks,
MB Shaikh.
ASKER
The problem does occur in webmail. I tried deleting the account and re-adding it and I had the same problem. I have found that if I send an email from an outside account to that email and I reply to it the reply is received. But if I create a new email and send it, it is not received. I checked the Transport Rules and I do not see anything that should be causing this.
Well, that rules out devices and indicates a server issue so the next step is diagnosing on the server itself.
Does the user's mailbox have quota limits set on it? If so are they nearly full? (Can cause issues in sending sometimes). I would also have a look at your SMTP logs as these should indicate at what stage the command is unrecognized and email refused.
Does the user's mailbox have quota limits set on it? If so are they nearly full? (Can cause issues in sending sometimes). I would also have a look at your SMTP logs as these should indicate at what stage the command is unrecognized and email refused.
ASKER
I followed your advice a second time and deleted the account, rebooted the server, recreated the account and it worked without issue after that. Thank you so much for your assistance!