使用Gmail API更改最大线路长度限制

Question

我正在尝试使用Python通过Gmail API发送电子邮件。但是当我检查收到的电子邮件时，我发现似乎每一行都在第78个字符处自动中断。屏幕截图如下所示：

这似乎是由RFC 2045引起的。但我可以重置一些参数，使每行更长吗？

我的代码如下所示：

import base64
from email.mime.audio import MIMEAudio
from email.mime.base import MIMEBase
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
import mimetypes
import os

#from __future__ import print_function
import httplib2
import os

from apiclient import discovery
import oauth2client
from oauth2client import client
from oauth2client import tools

from apiclient import errors

SCOPES = 'https://www.googleapis.com/auth/gmail.compose'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'send survey about assistance tool for Stack Overflow'

try:
        import argparse
        flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
        flags = None

def SendMessage(service, user_id, message):
    """Send an email message.

    Args:
        service: Authorized Gmail API service instance.
        user_id: User's email address. The special value "me"
        can be used to indicate the authenticated user.
        message: Message to be sent.

    Returns:
        Sent Message.
    """
    try:
        message = (service.users().messages().send(userId=user_id, body=message)
                             .execute())
        print 'Message Id: %s' % message['id']
        return message
    except errors.HttpError, error:
        print 'An error occurred: %s' % error


def CreateMessage(sender, to, subject, message_text):
    """Create a message for an email.

    Args:
        sender: Email address of the sender.
        to: Email address of the receiver.
        subject: The subject of the email message.
        message_text: The text of the email message.

    Returns:
        An object containing a base64url encoded email object.
    """
    message = MIMEText(message_text)
    message['to'] = to
    message['from'] = sender
    message['subject'] = subject
    return {'raw': base64.urlsafe_b64encode(message.as_string())}


def get_credentials():
        """Gets valid user credentials from storage.

        If nothing has been stored, or if the stored credentials are invalid,
        the OAuth2 flow is completed to obtain the new credentials.

        Returns:
                Credentials, the obtained credential.
        """
        home_dir = os.path.expanduser('~')
        credential_dir = os.path.join(home_dir, '.credentials')
        if not os.path.exists(credential_dir):
                os.makedirs(credential_dir)
        credential_path = os.path.join(credential_dir,
                                                                     'sendEmail.json')

        store = oauth2client.file.Storage(credential_path)
        credentials = store.get()
        if not credentials or credentials.invalid:
                flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
                flow.user_agent = APPLICATION_NAME
                if flags:
                        credentials = tools.run_flow(flow, store, flags)
                else: # Needed only for compatibility with Python 2.6
                        credentials = tools.run(flow, store)
                print('Storing credentials to ' + credential_path)
        return credentials
if __name__ == "__main__":
    credentials = get_credentials()
    http = credentials.authorize(httplib2.Http())
    service = discovery.build('gmail', 'v1', http=http)
    SendMessage(service, "me", CreateMessage("sender@gmail", "receiver@gmail.com", "Testing sending emails", "I want all my one sentence to be in each line and it will breaked by my specified line breakers.\n But it seems the line will break at 78 chars and can I reset that parameters to make it longer?"))

任何建议都会受到欢迎并提前致谢。