This mail server requires authentication when attempting to send to a non-local e-mail add

This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.

the best resource for email with asp.net (IMHO)

http://www.systemnetmail.com/

You will need to authenticate to send an email. Here's how:

http://www.systemnetmail.com/faq/4.2.aspx

Thanks

but when i try to send mail using my username and password it send correctly but when i use my other account like yahoo and hotmail it fail and this exception generates

User not local; please try a different path. The server response was: Sender address is not valid for your login. Check your email program settings.

Thanks in advance

Irfan Ullah

Did you figure this out?