new_contents: from contextlib import contextmanager
  import os
  import smtplib
  import database as db
  
  from email.mime.text import MIMEText
  
  from jinja2 import Template
  from database.model import Team
  
  from webapp.cfg import config
  
  
  @contextmanager
  def smtp_session():
      session = smtplib.SMTP(config.MAIL_SERVER, config.MAIL_PORT)
      if config.MAIL_USERNAME is not None:
          session.starttls()
          session.login(config.MAIL_USERNAME, config.MAIL_PASSWORD)
  
      try:
          yield session
      except:
          session.quit()
          raise
  
  
  def get_template(name):
      filename = "%s.txt" % name
      filepath = os.path.join(os.path.dirname(__file__), "templates", filename)
      if not os.path.isfile(filename):
          raise Exception("File not found!")
  
      with open(filepath, "r") as fn:
          return Template(unicode(fn.read(), "utf8"))
  
  
  def informal_to_teams(template_name, subject, debug=True):
      template = get_template(template_name)
      sender = "meet&eat Orga <%s>" % config.MAIL_DEFAULT_SENDER
      envelope = config.MAIL_DEFAULT_SENDER
  
      print "connect to SMTP...."
      with smtp_session() as session:
          print "Send Mails..."
          i = 0
          for team in db.session.query(Team).filter_by(deleted=False).filter_by(confirmed=True):
              content = template.render(name=team.name)
              msg = MIMEText(content, "plain", "utf8")
  
              rcpt = team.email
              if debug:
                  rcpt = config.MAIL_DEFAULT_SENDER
  
              msg['Subject'] = subject
              msg['From'] = sender
              msg['To'] = rcpt
  
              session.sendmail(envelope, [rcpt] + ["redaktion@exmatrikulationsamt.de"], msg.as_string())
              i+=1
          print "Mails sent: %d" % i
  
  
subject: Add code to send informal emails to the teams.