import os
import subprocess

def sendmail(msg):
    sendmail_executable = None
    for pth in ( '/usr/sbin', '/usr/bin', '/usr/local/sbin', '/usr/local/bin', '/sbin', '/bin'):
        if os.access(os.path.join(pth, 'sendmail'), os.X_OK):
            sendmail_executable = os.path.join(pth, 'sendmail')
            break
    if sendmail_executable is None:
        raise FileNotFoundError('Could not find sendmail executable')

    pipe = subprocess.Popen([ sendmail_executable, '-t' ], stdin=subprocess.PIPE)
    stdout, stderr = pipe.communicate(msg.as_bytes)
    return pipe.wait()