blocks|key|498507|text|作为参考，cpython+smtplib是阻塞的。也就是说，它会在连接时阻止GIL+(即Python)。尽管声称GIL是在I/O上发布的，但它只在一些I/O上发布，而SMTP连接不是这样的。要使其异步，您需要将邮件发送到另一个进程或线程，具体取决于您的情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|498508|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For reference, cpython smtplib is blocking. That is, it blocks the GIL (ie Python) while connecting. Despite the claims the GIL is released on I/O, it is only released on some I/O, and SMTP connections are not such.
To make it async, you need to hand the mail send to another process or thread, depending on your situation.

blocks|key|281757|text|也许我晚了4年，但这对我来说是有效的，也可能对其他人有帮助！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|281758|server+=+smtplib.SMTP("smtp.gmail.com",+587,+None,+30)|code-block|syntax|javascript|281759|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Maybe I am 4 years late, but this is what worked for me and might help someone else!

<pre><code>server = smtplib.SMTP("smtp.gmail.com", 587, None, 30)
</code></pre>

blocks|key|281800|text|我遇到了类似的问题，上面的答案对我都不起作用。我的问题是，因为我的smtp服务器使用SSL。我需要使用smtplib.SMTP_SSL而不是smtplib.SMTP。我只是在下面发布了我的完整工作代码。请确保在执行前更改了req和email_config的值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|281801|++++req+=+{
++++++++"email":+"to@something.com",
++++++++"subject":+"new+e-mail+from+python",
++++++++"body":+"Hi,\nI+am+a+bot",
++++}

++++email_config+=+{
++++++++"server":+"smtp.orange.fr",
++++++++"port":+465,
++++++++"username":+"username@orange.fr",
++++++++"password":+"mypassword",
++++++++"email":+"fromwhichemail@orange.fr",
++++}|code-block|syntax|javascript|281802|#!/usr/bin/env+python3
import+smtplib

from+email+import+encoders
from+email.mime.base+import+MIMEBase
from+email.mime.multipart+import+MIMEMultipart
from+email.mime.text+import+MIMEText

class+Mail(object):
++++def+__init__(self,+email_config):
++++++++self.email+=+email_config["email"]
++++++++self.password+=+email_config["password"]
++++++++self.server+=+email_config["server"]
++++++++self.port+=+email_config["port"]
++++++++print(f"Logging+to+{self.server}:{self.port}")
++++++++session+=+smtplib.SMTP_SSL(self.server,+self.port)
++++++++print(f"Calling+ehlo")
++++++++session.ehlo()
++++++++print(f"Calling+login")
++++++++session.login(self.email,+self.password)
++++++++self.session+=+session

++++def+send_message(self,+subject,+to,+body,+filename):
++++++++#+Create+a+multipart+message+and+set+headers
++++++++message+=+MIMEMultipart()
++++++++message["From"]+=+self.email
++++++++message["To"]+=+to
++++++++message["Subject"]+=+subject
++++++++message["Bcc"]+=+""
++++++++#+Add+body+to+email
++++++++message.attach(MIMEText(body,+"plain"))
++++++++print(f"tot:+{to}")
++++++++print(f"subject:+{subject}")
++++++++print(f"body:+{body}")

++++++++if+filename+is+not+None:
++++++++++++#+Open+PDF+file+in+binary+mode
++++++++++++with+open(filename,+"rb")+as+attachment:
++++++++++++++++part+=+MIMEBase("application",+"octet-stream")
++++++++++++++++part.set_payload(attachment.read())
++++++++++++#+Encode+file+in+ASCII+characters+to+send+by+email
++++++++++++encoders.encode_base64(part)
++++++++++++#+Add+header+as+key/value+pair+to+attachment+part
++++++++++++part.add_header(
++++++++++++++++"Content-Disposition",
++++++++++++++++f"attachment;+filename=+{filename}",)
++++++++++++#+Add+attachment+to+message+and+convert+message+to+string
++++++++++++message.attach(part)

++++++++#+Send+e-mail
++++++++print(f"Sending+e-mail...")
++++++++self.session.sendmail(self.email,+to,+message.as_string())

if+__name__+==+"__main__":
++++req+=+{
++++++++"email":+"to@something.com",
++++++++"subject":+"new+e-mail+from+python",
++++++++"body":+"Hi,\nI+am+a+bot",
++++}

++++email_config+=+{
++++++++"server":+"smtp.orange.fr",
++++++++"port":+465,
++++++++"username":+"username@orange.fr",
++++++++"password":+"mypassword",
++++++++"email":+"fromwhichemail@orange.fr",
++++}
++++m+=+Mail(email_config)
++++if+"pdf_file"+in+req:
++++++++m.send_message(req["subject"],+req["email"],+req["body"],+req["pdf_file"])
++++else:
++++++++m.send_message(req["subject"],+req["email"],+req["body"],+None)|281803|entityMap^0|1F|G|1Y|C|33|3|37|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

I ran into a similar issue and none of the answers above worked for me. My problem was that since my smtp server uses SSL. I needed to use <code>smtplib.SMTP_SSL</code>
instead of <code>smtplib.SMTP</code>. I just posting my full working code below.
Make sure to change values of <code>req</code> and <code>email_config</code> before executing.
<pre class="lang-py prettyprint-override"><code> req = {
 &quot;email&quot;: &quot;to@something.com&quot;,
 &quot;subject&quot;: &quot;new e-mail from python&quot;,
 &quot;body&quot;: &quot;Hi,\nI am a bot&quot;,
 }

 email_config = {
 &quot;server&quot;: &quot;smtp.orange.fr&quot;,
 &quot;port&quot;: 465,
 &quot;username&quot;: &quot;username@orange.fr&quot;,
 &quot;password&quot;: &quot;mypassword&quot;,
 &quot;email&quot;: &quot;fromwhichemail@orange.fr&quot;,
 }
</code></pre>
<pre class="lang-py prettyprint-override"><code>
#!/usr/bin/env python3
import smtplib

from email import encoders
from email.mime.base import MIMEBase
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

class Mail(object):
 def __init__(self, email_config):
 self.email = email_config[&quot;email&quot;]
 self.password = email_config[&quot;password&quot;]
 self.server = email_config[&quot;server&quot;]
 self.port = email_config[&quot;port&quot;]
 print(f&quot;Logging to {self.server}:{self.port}&quot;)
 session = smtplib.SMTP_SSL(self.server, self.port)
 print(f&quot;Calling ehlo&quot;)
 session.ehlo()
 print(f&quot;Calling login&quot;)
 session.login(self.email, self.password)
 self.session = session

 def send_message(self, subject, to, body, filename):
 # Create a multipart message and set headers
 message = MIMEMultipart()
 message[&quot;From&quot;] = self.email
 message[&quot;To&quot;] = to
 message[&quot;Subject&quot;] = subject
 message[&quot;Bcc&quot;] = &quot;&quot;
 # Add body to email
 message.attach(MIMEText(body, &quot;plain&quot;))
 print(f&quot;tot: {to}&quot;)
 print(f&quot;subject: {subject}&quot;)
 print(f&quot;body: {body}&quot;)

 if filename is not None:
 # Open PDF file in binary mode
 with open(filename, &quot;rb&quot;) as attachment:
 part = MIMEBase(&quot;application&quot;, &quot;octet-stream&quot;)
 part.set_payload(attachment.read())
 # Encode file in ASCII characters to send by email
 encoders.encode_base64(part)
 # Add header as key/value pair to attachment part
 part.add_header(
 &quot;Content-Disposition&quot;,
 f&quot;attachment; filename= {filename}&quot;,)
 # Add attachment to message and convert message to string
 message.attach(part)

 # Send e-mail
 print(f&quot;Sending e-mail...&quot;)
 self.session.sendmail(self.email, to, message.as_string())

if __name__ == &quot;__main__&quot;:
 req = {
 &quot;email&quot;: &quot;to@something.com&quot;,
 &quot;subject&quot;: &quot;new e-mail from python&quot;,
 &quot;body&quot;: &quot;Hi,\nI am a bot&quot;,
 }

 email_config = {
 &quot;server&quot;: &quot;smtp.orange.fr&quot;,
 &quot;port&quot;: 465,
 &quot;username&quot;: &quot;username@orange.fr&quot;,
 &quot;password&quot;: &quot;mypassword&quot;,
 &quot;email&quot;: &quot;fromwhichemail@orange.fr&quot;,
 }
 m = Mail(email_config)
 if &quot;pdf_file&quot; in req:
 m.send_message(req[&quot;subject&quot;], req[&quot;email&quot;], req[&quot;body&quot;], req[&quot;pdf_file&quot;])
 else:
 m.send_message(req[&quot;subject&quot;], req[&quot;email&quot;], req[&quot;body&quot;], None)



</code></pre>

I am writing a Python program to send an email. But every time when executing the clause:

<pre><code>smtpserver = smtplib.SMTP("smtp.gmail.com",587)
</code></pre>

it will block here and always stay the executing status without any prompts and errors. I don't know why. And can anyone help me?

The code is as following:
 import smtplib

<pre><code>to = 'toemail@gmail.com'
gmail_user = 'user@gmail.com'
gmail_pwd = 'password'
smtpserver = smtplib.SMTP("smtp.gmail.com",587)
smtpserver.ehlo()
smtpserver.starttls()
smtpserver.ehlo
smtpserver.login(gmail_user, gmail_pwd)
header = 'To:' + to + '\n' + 'From: ' + gmail_user + '\n' + 'Subject:testing \n'
print header
msg = header + '\n this is test msg from mkyong.com \n\n'
smtpserver.sendmail(gmail_user, to, msg)
print 'done!'
smtpserver.close()
</code></pre>

Python: when sending email, always blocked in the clause: smtpserver = smtplib.SMTP("smtp.gmail.com",587)

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Python

我正在编写一个Python程序来发送电子邮件。但每次执行该子句时：smtpserver = smtplib.SMTP("smtp.gmail.com",587)它将在这里阻塞，并始终保持正在执行状态，没有任何提示和错误。我也不知道原因。有人能帮我吗？代码如下: import smtplibto = 'toemail@g...

问Python:发送电子邮件时，总是在以下子句中被阻止: smtpserver = smtplib.SMTP("smtp.gmail.com",587)
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问Python:发送电子邮件时，总是在以下子句中被阻止: smtpserver = smtplib.SMTP("smtp.gmail.com",587)
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