SMTP mail rejected by firewall

I setup asp.net web project to send mail. It works fine within my companies
network. It sends mail ok to some of our clients, but some are rejected by t
he clients firewall. I noticed the header of a message sent by my asp.net ap
p says
Received: from server-name (unknown[ip-address](misconfigured sender))
server-name and ip-address both have the correct values in them.
How can I get rid of unknown and misconfigured sender? I am sure this is why
the firewall is rejecting the messages.
Posted by a user from .NET 247 (http://www.dotnet247.com/)
<Id>RPbU+RrMkECFfUAI35VCcw==</Id>In your script, are you specifying a SMTP server or just letting it using
its defaults?
David Lozzi
"Glenn via .NET 247" <anonymous@.dotnet247.com> wrote in message
news:eHi64Y3ZFHA.1412@.TK2MSFTNGP12.phx.gbl...
>I setup asp.net web project to send mail. It works fine within my companies
>network. It sends mail ok to some of our clients, but some are rejected by
>the clients firewall. I noticed the header of a message sent by my asp.net
>app says
> Received: from server-name (unknown[ip-address](misconfigured sender))
> server-name and ip-address both have the correct values in them.
> How can I get rid of unknown and misconfigured sender? I am sure this is
> why the firewall is rejecting the messages.
> --
> Posted by a user from .NET 247 (http://www.dotnet247.com/)
> <Id>RPbU+RrMkECFfUAI35VCcw==</Id>