reduce if statements to maximize efficiency in pyhon

I have write the following function to build parameters, i want to know that is there any other way in python to do that so that the code efficient is improved...

def build_parameters(to = None, toname = None, x-smtpapi = None, subject = None, text = None, html = None, from = None, cc = None, ccname = None, bcc = None, bccname = None, fromname = None, replyto = None, date = None, files = None, content = None, headers = None):
    param = {}
    if headers:
        param['headers'] = headers
    if content:
        param['content'] = content
    if files:
        param['files'] = files
    if date:
        param['date'] = date
    if replyto:
        param['replyto'] = replyto
    if fromname:
        param['fromname'] = fromname
    if bccname:
        param['bccname'] = bccname
    if bcc:
        param['bcc'] = bcc
    if ccname:
        param['ccname'] = ccname
    if cc:
        param['cc'] = cc
    if from:
        param['from'] = from
    if html:
        param['html'] = html
    if text:
        param['text'] = text
    if subject:
        param['subject'] = subject
    if x-smtpapi:
        param['x-smtpapi'] = x-smtpapi
    if toname:
        param['toname'] = toname
    if to:
        param['to'] = to

    return param