this is the python code:

# -*- coding: utf-8 -*-

from openerp import models, fields, api





def send_mail_example(self,cr,uid,ids,odoo_record,context=None):

	ir_mail_server = self.pool.get('ir.mail_server')

	title = "Your e-mail title"

	message = "This is the concent from your e-mail. An example from a field inside the e-mail: " + odoo_record.odoo_dns_url + "\n\nWith kind regards,\nYenthe"

	#Structure mail function: def build_email(self, email_from, email_to, subject, body, email_cc=None, email_bcc=None, reply_to=False,

        msg = ir_mail_server.build_email("test23.test@gmx.ch", ["test23.test@gmx.ch"], title, message,["test23.test@gmx.chh"],[],"test23.test@gmx.ch")

        ir_mail_server.send_email(cr, uid, msg)

thanks for your help 

What is wrong. When I click the button nothing happen. 

Hi diezcode,

There are quite some options and methods for this but I'll give you an example.

def send_mail_example(self,cr,uid,ids,odoo_record,context=None):
	ir_mail_server = self.pool.get('ir.mail_server')
	title = "Your e-mail title"
	message = "This is the concent from your e-mail. An example from a field inside the e-mail: " + odoo_record.odoo_dns_url + "\n\nWith kind regards,\nYenthe"
	#Structure mail function: def build_email(self, email_from, email_to, subject, body, email_cc=None, email_bcc=None, reply_to=False,
        msg = ir_mail_server.build_email("emailfrom@gmail.com", ["emailto@gmail.com"], title, message,["example@gmail.com"],[],"example@gmail.com") 
        ir_mail_server.send_email(cr, uid, msg)

With this example you could do about everything you need. Other options to use can be found under addons/mail/views/mail_mail.py in the official Odoo code, which contains a lot of e-mail functions.
You can trigger this Python function just like any other method with a button. I have an example module which explains how buttons work here: https://github.com/Yenthe666/Odoo_Samples/tree/master/button_action_demo

Update: and an example with a button inside the view (not in the topbar):

<button name="send_mail_example" type="object" string="Send E-mail"/>

Yenthe