@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        session['username'] = request.form['username'].lower()
        session['password'] = request.form['password']
        session['mail_server'] = request.form['mail_server']
        return render_template('errors.html', name=session['username'], password=session['password'], mailserv=session['mail_server'])