There are no open source projects on code project, as others have said. It IS a good idea to get involved in something like this as an aid to learning, so I'd say go to source forge, look for a project that interests you, and get involved.
Driven to the arms of OSX by Vista.
Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.
Check You Will Get Failure Delivery to To address Sometimes..!
Then There is security problem..!
There Must be From Address related problems also..!
BTW Which Credentials You are Using ..!
some domain names restrict some address..!
Why Do Some People Forget To Mark as Answer .If It Helps.
I sending mail using smtp server...I am using smtpclient.Host="localhost" and smtpclient.port=25 , But gives authentication error ....Tel me how will i know my smtp server name or any common host and port also...
and also give error -"Property 'To' is ReadOnly." for this line