custom mail application- remote certificate is invalid error

Hello all,

I have developed a one simple windows desktop application(vs2010) which will send the mails to the list of different user's emails.

For that i have given the settings of host name of mail service provider, Port number, company's email (sender) , password(of sender). This settings are filled by client.. 

Now this application is run successfully at our side. But when we deploy to client side and settings addetn then try to send mails it gives the error.

"The remote certificate is invalid according to the validation procedure."

 

 

 

I am totally new to SSL certificate. how to get the ssl certificate and do we need to include the ssl certificate in application and install on each client machine..

. One more thing different client has different mail service provider some uses gmail some uses personal domain..

then how to deal this issue.

Please please reply me...

Thanks in advance...