This error (530 Relaying Not Allowed) occurs when a user or mail client attempts to send email without authenticating on the mail server. If this error occurs please follow the below options to resolve the issue.
|1. Outlook 2000
Go to Tools > Services (or Tools > Accounts, if Services is not listed). Select your Internet E-Mail Account and press “Properties.” Go to the “Servers” tab, and check “My server requires authentication” under Outgoing Mail Server. Press “Settings,” select “Use same settings as my incoming mail server,” then press “OK” three times to save the changes & return to Outlook. Finally, restart your computer.
2. Outlook 2002 & 2003
3. Outlook 2007, 2010 & 2012
4. Outlook Express