Python：邮件发送在SSL读取时失败

Question

我在尝试通过'smtp.gmail.com'发送邮件时，总是遇到这个间歇性的错误。

Traceback (most recent call last):

  File "/var/home/ptarjan/django/mysite/django/core/handlers/base.py", line 92, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File "/var/home/ptarjan/django/mysite/registration/views.py", line 137, in register
    new_user = form.save()

  File "/var/home/ptarjan/django/mysite/registration/forms.py", line 79, in save
    email=self.cleaned_data['email'])

  File "/var/home/ptarjan/django/mysite/django/db/transaction.py", line 240, in _commit_on_success
    res = func(*args, **kw)

  File "/var/home/ptarjan/django/mysite/registration/models.py", line 120, in create_inactive_user
    registration_profile.send_registration_mail()

  File "/var/home/ptarjan/django/mysite/registration/models.py", line 259, in send_registration_mail
    send_mail(subject, message, settings.DEFAULT_FROM_EMAIL, [self.user.email])

  File "/var/home/ptarjan/django/mysite/django/core/mail.py", line 390, in send_mail
    connection=connection).send()

  File "/var/home/ptarjan/django/mysite/django/core/mail.py", line 266, in send
    return self.get_connection(fail_silently).send_messages([self])

  File "/var/home/ptarjan/django/mysite/django/core/mail.py", line 172, in send_messages
    sent = self._send(message)

  File "/var/home/ptarjan/django/mysite/django/core/mail.py", line 186, in _send
    email_message.message().as_string())

  File "/usr/lib/python2.5/smtplib.py", line 704, in sendmail
    (code,resp) = self.data(msg)

  File "/usr/lib/python2.5/smtplib.py", line 484, in data
    (code,repl)=self.getreply()

  File "/usr/lib/python2.5/smtplib.py", line 352, in getreply
    line = self.file.readline()

  File "/usr/lib/python2.5/smtplib.py", line 160, in readline
    chr = self.sslobj.read(1)

sslerror: The read operation timed out

我正在使用Django 1.1，并且安装了django-registration这个应用。在我的settings.py文件中有这些设置。

EMAIL_HOST = 'smtp.gmail.com'
EMAIL_HOST_USER = "**SECRET**"
EMAIL_HOST_PASSWORD = "**SECRET**"
EMAIL_PORT = 587
EMAIL_USE_TLS = True

Answer 1

看起来，Gmail 有时候可能反应比较慢，所以你的操作就会超时。你可以试着用一个“尝试/捕获”的方法来处理这些问题，也就是说，当出现问题时，可以捕捉到这个错误，然后再试几次（可能在每次尝试之间等一会儿）。顺便说一下，这个任务似乎很适合用一个专门的线程来处理，也就是一个可以重复发送邮件的操作。

Answer 2

虽然我不知道为什么，但我经历过这个问题，并且当你按照特定的顺序设置这些变量时，它是有效的：

• EMAIL_HOST
• EMAIL_PORT
• EMAIL_HOST_USER
• EMAIL_HOST_PASSWORD
• EMAIL_USE_TLS