Hi
I'm trying to send mail via SMTP server.it works when all recipients are on same sarver(for example my server is "a" and when all recipients are hhha@a it is working correctly ) but when i use a recipient on yahoo (for example) it gives me error:
The server rejected one or more recipient addresses. The server response was: 550 not local host yahoo.com, not a gateway
would you please help me???
thank you

Isn't there any one can help me please?????should i ask my host to fix it?or there is a problem somewhere in my codings?????

I am not entirely too sure about this answer so corrections may be needed but have you tried to email a yahoo account from your smtp server. The answer you are looking for may not be found here but on Microsoft's site for SMTP. Your local SMTP server, or server iteself, needs to be configured to find yahoo.com and where to send the mail too. In other words, you need to configure your server to speak to yahoo's smtp server to pass mail to it. Forgive the lesson on inet mail if you already know or i am off but When you send email from your inet provider, it finds the server it needs to go to throug hthe DNS it is registered too. From there it sends the email to that server that then hads it out to the receipient or returns an error reponse. If your local server does not know where yahoo is, it will not be able to deliver.

Not a complete server config expert but know a little something.

Thank you for you reply.i was getting disapponted to see a reply for my question.
I contact my host they told me they set my domain name for IMAP and POP3 mails on my server and i should use CDOSYS for writting mail program.but there is a question:
i used CDOSYS in asp programms befor and not sure if i can use it in the same way in asp.net programms(vb).what is its namespace?should i use system.web.mail as before???or it has another namespace?
thank you again for your help