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I created a mailbox for my domain since it was not allowing email to non-local account. I set up mail forwarding from that email. This works but no other solution worked.
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I have godaddy VPS. Its windows server with plesk. Two websites are hosted. for one of them email function works for the other one it gives 503 error, smtp authentication, This mail server requires authentication when attempting to send to a non-local e-mail address.
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I have godaddy VPS. Its windows server with plesk. Two websites are hosted. for one of them email function works for the other one it gives 503 error, smtp authentication, This mail server requires authentication when attempting to send to a non-local e-mail address.

PHP mail settings

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PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.