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Outlook send error, Can someone help

By ossyemeh ·
Hi all,
Please can someone help to resolve this. I have my outlook2007 configured and from all indications the account setting is well configured. After configuration all worked well, can send and receive, but after a day it stopped sending but can receive. It returns error as below "Send test e-mail message: Cannot send the message. Verify the e-mail address in your account properties. The server responded: 550 Relaying not allowed" I know its not a firewall issue as my windows firewall is disable and in the office we are using ISA server and all other users can send and receive without any problem.

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Outlook error "550 Relaying not allowed".....

550 - Relaying not allowed

This error message is coming from the mail server, not from OE itself. It means that the SMTP (outgoing) mail server did not recognize you as an authorized user and so rejected your message. Most ISPs configure their SMTP servers to recognize only those whose IP address is on the accepted list, meaning that you are connected directly to that ISP. If you use multiple ISPs, you are likely to encounter this problem. The solution is to change the SMTP server for that mail account under Tools| Accounts| <account name> Properties| Servers.

Another possible reason for this error is anti-virus software that configures OE to use a local proxy for the SMTP server. Since scanning e-mail is not necessary to protect your computer, you should disable the e-mail scan in your anti-virus product, and then re-enter the correct name for your SMTP server.

Setting Up Mail Servers in Outlook Express:

http://www.microsoft.com/windows/ie/community/columns/mailserver.mspx


Troubleshoot 550, 553, and relay-prohibited errors:

http://office.microsoft.com/en-us/outlook-help/troubleshoot-550-553-and-relay-prohibited-errors-HA001112833.aspx

Edited to add more info.

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