问题描述：
用flask mail发送图片邮件（正文中的图片），在mac系统邮件客户端上，图片出现重复展示问题，即展示了正文图片，同时也把图片作为附件进行了展示，用原生smtp方式发送的图片邮件没有出现该问题；
（只在mac上出现，windows上没有出现）
求助点：
发送的图片邮件，在mac上出现重复展示问题，一张是正文，一张是附件，需要了解flask mail 发送图片邮件，通过什么方式能在mac上不重复展示（mac自带邮箱客户端）：
代码：
flask mail发送邮件代码：
from flask import *
from flask_mail import *
import base64
app = Flask(__name__)
app.config["MAIL_SERVER"] = 'smtp.jiguang.cn'
app.config["MAIL_PORT"] = 465
app.config["MAIL_USERNAME"] = 'xiaxx@jiguang.cn'
app.config['MAIL_PASSWORD'] = 'xxxx'
app.config['MAIL_USE_TLS'] = False
app.config['MAIL_USE_SSL'] = True
mail = Mail(app)
@app.route('/')
def send_email():
# send_email_func('emailTemplate', img=img)
send_email_func()
return "sent ok"
def send_async_email(app, msg):
with app.app_context():
mail.send(msg)
def send_email_func():
app = current_app._get_current_object()
msg = Message(subject="hello", body="hello", sender="xiaxx@jiguang.cn", recipients=["xiaxx@jiguang.cn"])
# msg.body = render_template(template + '.txt', **kwargs)
# msg.html = render_template(template + '.html', **kwargs)
msg.html = '<img src="cid:image"> <p>用flask mail发送图片邮件，测试邮件发送内联图片功能</p>'
with app.open_resource("test.png") as fp: # 打开本地图片即可
msg.attach("image.png", "image/png", fp.read(), 'inline', headers=[('Content-ID', 'image')])
send_async_email(app, msg)
if __name__ == '__main__':
app.run(debug=True)
smtp方式代码（这种方式发送的图片邮件在mac上能正常展示，没有重复）：
# Send an HTML email with an embedded image and a plain text message for
# email clients that don’t want to display the HTML.
from email.encoders import encode_base64
from email.mime.base import MIMEBase
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
# Define these once; use them twice!
strFrom = 'xiaxx@jiguang.cn'
strTo = 'xiaxx@jiguang.cn'
# Create the root message and fill in the from, to, and subject headers
msgRoot = MIMEMultipart('related')
msgRoot['Subject'] = 'test message'
msgRoot['From'] = 'xiaxx@jiguang.cn'
msgRoot['To'] = 'xiaxx@jiguang.cn'
msgRoot.preamble = 'This is a multi-part message in MIME format.'
# Encapsulate the plain and HTML versions of the message body in an
# 'alternative' part, so message agents can decide which they want to display.
msgAlternative = MIMEMultipart('alternative')
msgRoot.attach(msgAlternative)
msgText = MIMEText('This is the alternative plain text message.')
msgAlternative.attach(msgText)
# We reference the image in the IMG SRC attribute by the ID we give it below
msgText = MIMEText('用smtp发送图片邮件，测试邮件发送功能<img src="cid:image1"><br>Nifty!', 'html')
msgAlternative.attach(msgText)
# This example assumes the image is in the current directory
fp = open('test.png', 'rb')
msgImage = MIMEImage(fp.read())
fp.close()
# Define the image's ID as referenced above
msgImage.add_header('Content-ID', '<image1>')
msgRoot.attach(msgImage)
# Send the email (this example assumes SMTP authentication is required)
import smtplib
smtp = smtplib.SMTP()
smtp.connect('smtp.jiguang.cn')
smtp.login('xiaxx@jiguang.cn', 'xxxx')
# smtp.sendmail(strFrom, strTo, msgRoot.as_string())
smtp.sendmail(strFrom, strTo, msgRoot.as_bytes())
smtp.quit()
mac系统邮件客户端截图：
flask mail发送的图片邮件（重复展示，一张是正文，一张是附件）
求大佬帮忙看下，flask mail通过什么属性能让图片邮件在mac上能不重复展示
