1. 部署在heroku后，注册用户时无法发送邮件，本地测试时没有问题。

2. 本地测试是在虚拟环境下测试，没模拟部署环境测试

3. google后看到的前几个大多是因为用了gmail的原因，我用的是网易邮箱。

返回的logs：

2016-11-22T10:22:19.945749+00:00 heroku[router]: at=info method=GET path="/auth/unconfirmed" host=oflasky1122a.herokuapp.com request_id=09fc8f05-a0af-45a5-8329-58eef0223d05 fwd="1.62.97.88" dyno=web.1 connect=1ms service=21ms status=200 bytes=4297
2016-11-22T10:22:53.409764+00:00 app[web.1]: Exception in thread Thread-3:
2016-11-22T10:22:53.409772+00:00 app[web.1]: Traceback (most recent call last):
2016-11-22T10:22:53.409774+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/threading.py", line 801, in __bootstrap_inner
2016-11-22T10:22:53.409776+00:00 app[web.1]:     self.run()
2016-11-22T10:22:53.409777+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/threading.py", line 754, in run
2016-11-22T10:22:53.409779+00:00 app[web.1]:     self.__target(*self.__args, **self.__kwargs)
2016-11-22T10:22:53.409779+00:00 app[web.1]:   File "/app/app/email.py", line 9, in send_async_email
2016-11-22T10:22:53.409780+00:00 app[web.1]:     mail.send(msg)
2016-11-22T10:22:53.409780+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask_mail.py", line 492, in send
2016-11-22T10:22:53.409781+00:00 app[web.1]:     message.send(connection)
2016-11-22T10:22:53.409781+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask_mail.py", line 152, in __exit__
2016-11-22T10:22:53.409782+00:00 app[web.1]:     self.host.quit()
2016-11-22T10:22:53.409782+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 772, in quit
2016-11-22T10:22:53.409783+00:00 app[web.1]:     res = self.docmd("quit")
2016-11-22T10:22:53.409783+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 393, in docmd
2016-11-22T10:22:53.409783+00:00 app[web.1]:     self.putcmd(cmd, args)
2016-11-22T10:22:53.409784+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 341, in putcmd
2016-11-22T10:22:53.409784+00:00 app[web.1]:     self.send(str)
2016-11-22T10:22:53.409785+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 333, in send
2016-11-22T10:22:53.409785+00:00 app[web.1]:     raise SMTPServerDisconnected('please run connect() first')
2016-11-22T10:22:53.409785+00:00 app[web.1]: SMTPServerDisconnected: please run connect() first

返回以上错误时smtp的配置是MAIL_PORT = 25，MAIL_USE_TLS = True

相关代码email.py

from threading import Thread
from flask import current_app, render_template
from flask_mail import Message
from . import mail


def send_async_email(app, msg):
    with app.app_context():
        mail.send(msg)


def send_email(to, subject, template, **kwargs):
    app = current_app._get_current_object()
    msg = Message(app.config['FLASKY_MAIL_SUBJECT_PREFIX'] + ' ' + subject,
                  sender=app.config['FLASKY_MAIL_SENDER'], recipients=[to])
    msg.body = render_template(template + '.txt', **kwargs)
    msg.html = render_template(template + '.html', **kwargs)
    thr = Thread(target=send_async_email, args=[app, msg])
    thr.start()
    return thr
从哪里分析呢？可能是哪出了问题呢？

这还有个解决办法不过代码我没有看懂。

stmp配置：

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'hard to guess string'
    SSL_DISABLE = False
    MAIL_SERVER = 'smtp.163.com'
    MAIL_PORT = 465
    MAIL_USE_SSL = True
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    FLASKY_MAIL_SUBJECT_PREFIX = '[oFlasky]'
    FLASKY_MAIL_SENDER = 'b1a2b3c4d@163.com'
    FLASKY_ADMIN = os.environ.get('FLASKY_ADMIN')

前一次配置文件中的MAIL_USE_SSL没有配置，而是使用的TLS，MAIL_PORT 也是按照网易官网写的25。今天改成以上的配置了，还是返回错误：

2016-11-25T08:06:23.816541+00:00 heroku[router]: at=info method=GET path="/auth/unconfirmed" host=oflasky1125.herokuapp.com request_id=89ce5af6-937b-42e6-903b-37adb7798164 fwd="1.58.89.48" dyno=web.1 connect=1ms service=21ms status=200 bytes=4381
2016-11-25T08:09:16.705329+00:00 app[web.1]: Exception in thread Thread-2:
2016-11-25T08:09:16.705345+00:00 app[web.1]: Traceback (most recent call last):
2016-11-25T08:09:16.705347+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/threading.py", line 801, in __bootstrap_inner
2016-11-25T08:09:16.705348+00:00 app[web.1]:     self.run()
2016-11-25T08:09:16.705349+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/threading.py", line 754, in run
2016-11-25T08:09:16.705350+00:00 app[web.1]:     self.__target(*self.__args, **self.__kwargs)
2016-11-25T08:09:16.705351+00:00 app[web.1]:   File "/app/app/email.py", line 9, in send_async_email
2016-11-25T08:09:16.705351+00:00 app[web.1]:     mail.send(msg)
2016-11-25T08:09:16.705352+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask_mail.py", line 491, in send
2016-11-25T08:09:16.705353+00:00 app[web.1]:     with self.connect() as connection:
2016-11-25T08:09:16.705353+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask_mail.py", line 144, in __enter__
2016-11-25T08:09:16.705354+00:00 app[web.1]:     self.host = self.configure_host()
2016-11-25T08:09:16.705355+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask_mail.py", line 156, in configure_host
2016-11-25T08:09:16.705355+00:00 app[web.1]:     host = smtplib.SMTP_SSL(self.mail.server, self.mail.port)
2016-11-25T08:09:16.705356+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 801, in __init__
2016-11-25T08:09:16.705357+00:00 app[web.1]:     SMTP.__init__(self, host, port, local_hostname, timeout)
2016-11-25T08:09:16.705357+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 256, in __init__
2016-11-25T08:09:16.705358+00:00 app[web.1]:     (code, msg) = self.connect(host, port)
2016-11-25T08:09:16.705359+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 316, in connect
2016-11-25T08:09:16.705359+00:00 app[web.1]:     self.sock = self._get_socket(host, port, self.timeout)
2016-11-25T08:09:16.705360+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/smtplib.py", line 806, in _get_socket
2016-11-25T08:09:16.705361+00:00 app[web.1]:     new_socket = socket.create_connection((host, port), timeout)
2016-11-25T08:09:16.705362+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/socket.py", line 575, in create_connection
2016-11-25T08:09:16.705362+00:00 app[web.1]:     raise err
2016-11-25T08:09:16.705363+00:00 app[web.1]: error: [Errno 110] Connection timed out

错误不一样了。。。