Outlook Express : Relaying denied.

Posted on 2004-11-17
Last Modified: 2008-03-03
Since i switched from isdn to adsl i get the following error when trying to send a mail:

Relaying denied. Proper authentication required.', Port: 25, Secure(SSL): Yes, Server Error: 550, Error Number: 0x800CCC79

Even when i turn on smtp authentication i still get this error.

When i switch back to dial in connection i don't get the error message.

Is something different with the way adsl handles authentication??
What causes this problem?

Any help would be very appreciated
Question by:mkraan
    LVL 49

    Expert Comment

    Hi mkraan,

    Is there any firewall program associated with your adsl connection ? If yes or no, try to turn off any firewall and
    anti-virus temporarily and see if that would help

    After checking "outgoing mail server requires authentication", click on "settings"
    and give the username and password there and also check the option of connecting securely in there.
    See if that would help .

    Have you ever been able to send email in OE using adsl. If yes , then delete the email account, create it again and see if that would help

    Post back how it goes


    Author Comment

    Hi sunray,

    After turning of firewall and anti virus, is still receive the error..
    I also tried entering username and password and Secure Password Authentication..

    I have 2 e-mail accounts : one is from myl old internet provider, the other is from my work.
    With both i cannot send e-mail now, and return the same error messages.

    This also happens when i try to send the mail using the same account on another pc, on cable adsl..
    LVL 49

    Expert Comment

    using adsl connection , can you go command prompt and ping the outgoing mail server..


    Author Comment

    yes i can ping the smtp server
    LVL 49

    Expert Comment

    Does it happen if you send email to any email address or only specific ones ?
    LVL 49

    Accepted Solution

    when you use dialup what is the outgoing mail server you are using ?

    when you use Adsl , what outgoing mail server you are using ?

    For me in my OE
    if i am in my univ i use.
    if i am at home and using cable (comcast) , i use

    so when you use adsl , try to give smtp.<adsl>.net  

    Author Comment

    good question
    Most addresses i get that error, but with one address it sends without error.
    With dialin i can send mail to every adress.
    LVL 13

    Assisted Solution

    That is an SMTP Relay Blocking error.  The ISP you are using now is not allow you to send email through other providers, but your old ISP will let you send through other providers.  Only your ISP can resolve this, in which they will probably tell you that you must use your username and password for their servers and use their SMTP server(s) for sending mail.  In which case, if you are wanting replies to come to a different address (like your work), then you would have to enter that address as a "Reply address" when you setup the account in Outlook Express.  Then replies will go to the address you want, but mail will always be sent from your new ISP's account.  

    Hope this helps.


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