MailSocket (actually, this class is created with the U++ SmtpMail code)

EMail   
POP3Mail
SMTPMail (I know there is already a SmtpMail, but I found it hardly useful).
IMAP 

#ifndef _SmtpExample_SmtpExample_h
#define _SmtpExample_SmtpExample_h

#include <CtrlLib/CtrlLib.h>
#include <Web/Web.h>
using namespace Upp;

#define LAYOUTFILE <SmtpExample/SmtpExample.lay>
#include <CtrlCore/lay.h>

class SmtpExample : public WithSmtpExampleLayout<TopWindow> {
public:
	typedef SmtpExample CLASSNAME;
	SmtpExample();
	
	SmtpMail smtp;
	
	void	Send();
};

SmtpExample::SmtpExample()
{
	CtrlLayout(*this, "Smtp Example");
	
	smtp.Transcript();
	smtp.Subject("Smtp Example");
	smtp.Port(25);
	smtp.Host("smtp.host.com");
	smtp.Auth("username", "password");
	smtp.From("from");
	smtp.To("to");
	smtp.AttachFile("filename", mimetype = 0);
	SendButton << THISBACK(Send); 

}

void SmtpExample::Send()
{
	smtp.Send();
	LogConsole.Set(smtp.GetTranscript());
}


GUI_APP_MAIN
{
	SmtpExample().Run();
}