log = logging.getLogger()
log.setLevel(logging.DEBUG)
debug_format = logging.Formatter("%(levelname)s at %(asctime)s in %(filename)s (line %(lineno)d):: %(message)s")

# write errors to email
error_mail_subject = "ERROR: Script error in %s on %s" % (sys.argv[0], os.uname()[1])
error_mail_handler = logging.handlers.SMTPHandler(SMTP_HOST, 'errors@'+os.uname()[1], [LOG_EMAIL], error_mail_subject)
error_mail_handler.setLevel(logging.ERROR)
#error_mail_handler.setLevel(logging.DEBUG)
error_mail_handler.setFormatter(debug_format)

# buffer debug messages so they can be sent with error emails
memory_handler = logging.handlers.MemoryHandler(1024*10, logging.ERROR, error_mail_handler)
memory_handler.setLevel(logging.DEBUG)

# attach handlers
log.addHandler(memory_handler)
log.addHandler(error_mail_handler)

# init
log_handler1 = BufferingSMTPHandler(
    'smtp.host.lala', "from@test.com", ['to@test.com'], 'Log event(s)',5000)
...
logger.addHandler(log_handler1)
...

# main code
...
if internet_connection_ok and seconds_since_last_flush>60:
    log_handler1.flush() # send buffered log records (if any)