returned email error code 473

Posted on 2004-04-23
Last Modified: 2007-12-19
Sometime but not always an account I have gets this error as I send mail out.  It is a pop3 mail account.  i am unable to find anything on it in Microsoft's KB.  I am using Outlook 2003.

Your message did not reach some or all of the intended recipients.

      Subject:      FW: new client
      Sent:      4/22/2004 10:13 PM

The following recipient(s) could not be reached:

      '' on 4/22/2004 10:13 PM
            473 relaying prohibited. You should authenticate first

Does anyone know how I can get rid of it?

Question by:GaryHess
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LVL 13

Accepted Solution

Mob-bom earned 500 total points
ID: 10900037
Under your account settings for your pop3 account, you may want to try checking the box for Log On using Secure Password Authentication

Author Comment

ID: 10901723
I've checked that off now but am still having the problem.
LVL 13

Expert Comment

ID: 10901780
This error most likely has to do with the SMTP server settings.  I would suggest making sure that the SMTP settings are consistant with what your ISP's are -not- your email providers.

Your ISP SMTP server is called
Your email is ABC-Email.
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LVL 13

Expert Comment

ID: 10901789
Sorry, but to clarify, this is not a software issue, rather an issue with the SMTP server and the settings that you are using.

Author Comment

ID: 10917899
I looked at the settings and both the incoming and outgoing mail server are set to

I tried setting it to smtp for the outgoing server but it then failed to find it.  The company seems to be hosting there own mail.

I also am trying one setting change along the lines of your first suggestion and in the advanced area have set the outgoing mail to also authenticate with the same cedentials.

The problem is intermitent so I am testing it out to see if it still is an issue.

Any further suggetions to try are appreciated.
LVL 13

Expert Comment

ID: 10918174
Ok, so the isp provider is and your email is


Author Comment

ID: 10918239
The ISP we use is Verison.  The email is provided by work.
Provider is
LVL 13

Expert Comment

ID: 10918460
I believe that verizon has a relay policy in effect that will block using another's smtp server.  Try leaving the incoming/pop3 settings to your email as is, but change the outgoing/smtp to verizon's smtp server, which I believe is

Author Comment

ID: 11282323
I still have the problem.  I have not accepted teh answer.  Feel free to close it.

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