unknown or illegal alias

Posted on 2005-04-12
Last Modified: 2008-01-09
I've set up a brand new Windows 2003/Exchange 2003 server.  Some people are having problems emailing our organization with the error message "unknown or illegal alias Port 25, Secure(SSL): No, Server error 550 Error Number 0x800CCC79).  We are getting email from many other prople though so it's not a global problem.  Not sure why the SSL is in there as we're not using it currently.
Question by:LegDrop
    LVL 104

    Expert Comment

    The SSL part is actually saying:

    Secure(SSL): No

    ie - you aren't using SSL.

    This is people from other companies emailing you? That error would normally be seen locally - ie they have made an error with their local configuration.
    Any pattern to the error messages?
    have you made any recent changes to the DNS for your domain for this new server? Have you given it enough time to replicate those changes?

    Exchange MVP.

    Author Comment

    Yes, these are coming from outside the organization.  The only pattern I can see is that the errors are generated from people using the same ISP.  I know that as where I live there are only 3 possible ISPs and I've asked the people sending to use which ISP they use.  That's strange but it's the only pattern.  All other emails come through if sending from the 2 other local ISPs or from Hotmail, Yahoo, etc.  

    Dns has been up and running for months as the web site works so I know it's not a propogation or other DNS problem.
    LVL 104

    Accepted Solution

    If it is a single ISP that is causing the problems then they may have DNS issues. I would call them and see if there is a trial account that you can setup and see what happens for yourself. You can then run DNS queries against their DNS servers to see whether any errors come back.


    Author Comment

    This is also the only thing left I haven't done.  I will contact the ISP and see what they have to say.

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