5.7.1 smtp;550 5.7.1 Unable to relay for

Posted on 2005-05-16
Last Modified: 2012-08-13
Hi --

We are running Windows 2003 and Exchange 2003. For some external e-mail addresses (not all) we get this error:

 You do not have permission to send to this recipient.  For assistance, contact your system administrator.
<5.7.1 smtp;550 5.7.1 Unable to relay for>

I have turned on logging for our SMTP server but I can't find anything relating to this in that log file. I have looked up this error message on Google and changed relay settings to allow authenticated users, etc.. and like I said, it doesn't happen for all external domains just some.

I am thinking that perhaps the e-mail is being bounced by the server at the other end..



Question by:rwmorey
    LVL 13

    Expert Comment

    If they are blocking any domain names from there system you will recieve that message.  You will want to contact the administrator of the mailbox to troubleshoot mail flow issues like these.  If your server is sending messages out, then it is more then likely their issue.
    LVL 1

    Author Comment

    Ok.. I have put a call in to our client who we cant' send e-mails too and am awaiting a return call from thier IT department.
    LVL 7

    Accepted Solution

    You should add a SMTP connector.  Open Server Management>Advanced Management>Exchange.  Right Click on Connectors and  choose New>SMTP Connector. On the General tab choose "Forward all mail through the following smart hosts" and enter the name of your ISP's smtp server. In the Address Space tab you should have Type: SMTP Address Space: * and Cost:1.  It is important to have the * as the Address Space.  Also be sure to enable on the Address Space tab: Allow Messages to be relayed to these domains.
    LVL 1

    Author Comment

    Hi --

    There is a SMTP Connector already installed.. I checked the settings you suggeste dand the only thing that was not set was the "Allow Messages to be relayed to these domains." I turned this on but am still not able to send e-mail to the few external domains. I did not hear back from thecompany we were trying to e-mail to see if their server was blocking our mail.


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