I know that SMTP is port 25 it says it on the website to and it's closed from my ip and i don't know how to open it and it might be the host any suggestions

it's the code above the one mandai posted

Hi again your code compiles fin however when i click the button to send it i get this error: An unhandled exception of type 'System.Net.Mail.SmtpException' occurred in System.dll

Can you do a search for me, I'm doing a search for 13 hours, did you use SMTP to send email?

I using visual studio 2010 C++ Windows form application with net framework 4 and I want to send a simple text email without any login requirement. The code will read the text in richtextbox1 and email it to my email. which is custom email for example : example@custom.com