I have been struggling in finding a solution that can be applied to my case, as I viewed and reviewed many questions related to this issue. I have a script which sends periodically reports to a list of recipients. Everything worked fine until today 4 am, when I checked my inbox and the reports didn't come.
By debugging the code:
import smtplib
username="my.user.account@gmail.com"
password="my.correct.password"
server=smtplib.SMTP('smtp.gmail.com',587)
server.ehlo()
server.starttls()
server.ehlo()
server.login(username,password)
#if login worked, it should send a message, but it is not working, so I will suppress this part
server.quit()
I receive the following (old known) result:
(250, b'smtp.gmail.com at your service, [SERVERIP]\nSIZE 35882577\n8BITMIME\nSTARTTLS\nENHANCEDSTATUSCODES\nPIPELINING\nCHUNKING\nSMTPUTF8') (220, b'2.0.0 Ready to start TLS') (250, b'smtp.gmail.com at your service, [SERVERIP]\nSIZE 35882577\n8BITMIME\nAUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH\nENHANCEDSTATUSCODES\nPIPELINING\nCHUNKING\nSMTPUTF8') Traceback (most recent call last): File "", line 6, in server.login(username,password) File "C:\Python\Python36\lib\smtplib.py", line 729, in login raise last_exception File "C:\Python\Python36\lib\smtplib.py", line 720, in login initial_response_ok=initial_response_ok) File "C:\Python\Python36\lib\smtplib.py", line 641, in auth raise SMTPAuthenticationError(code, resp) smtplib.SMTPAuthenticationError: (534, b'5.7.14 Please log\n5.7.14 in via your web browser and then try again.\n5.7.14 Learn more at\n5.7.14 https://support.google.com/mail/answer/78754 r131sm2964505vkr.40 - gsmtp')
Things I've tried
Allow less secure apps (as indicated in https://www.google.com/settings/security/lesssecureapps): This flag was set to true since I created the account Disable Captcha (as indicated in https://accounts.google.com/DisplayUnlockCaptcha): Visited this URL several times. No luck. Login via browser: It works fine, when logging via any Internet Browser from any computer, although in the first times I had to insert a code sent to the account's recovery phone.
I came across other things I could try, but I am not sure it could work:
- Specific app passwords
- Oauth2
- Change or reset password
I will probably try oauth2, however it would require a change in my code, which I want to avoid due to some restrictions in the server. What really freaks me out is that it was working fine and suddenly stopped!
Any help will be very appreciated!
I have solved this using the Google Gmail API. It seems Google has either blocked or limited logins for my account through unknown devices, as I could login only via the browser and after I confirmed the telephone number and an code sent by SMS.
So I decided to give up using smtplib and implemented the access using the API Google uses for Gmail: https://developers.google.com/api-client-library/python/ https://developers.google.com/gmail/api/guides/sending
Hope this helps other who had trouble with this issue.
I had this issue as well. My mail forwarder script that has been working fine for 6+ months randomly started throwing this error:
534, b'5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbts\n5.7.14 y2ku2-8KrWsn_dAUhnkssuTuESwaeG-DNn9hWBpsSpJCmVL ZhH24jzJfd-5bHUdh993dJ7\n5.7.14 a5LsAOJrheyT0cRXIhMSbycqvMAC7sNrizO5qU_6iDescJcQa-QqUUCFVH7IZoWF9uXyrv\n5.7.14 HC9XzAW-pBwgUjV4i_ts8CNhB_yZf2JHOi-wl6gZ9jwAiYLWx DPe7epI> Please log\n5.7.14 in via your web browser and then try again.\n5.7.14 Learn more at\n5.7.14 https://support.google.com/mail/answer/78754 y5sm3059043 9pge.49 - gsmtp
After some research I tried all the following steps:
- Checking allow low secure apps in Google settings (it was already on, tried turing it off and back on)
- Trying the unlock captcha link: https://accounts.google.com/DisplayUnlockCaptcha
- Singing in and out of Google account manually (verifying with phone number)
- Changing the account password
- Enabling and disabling 2FA
- Countless other things...
Nothing seemed to actually work at first. However, after doing all the above steps, the script started working again ~24 hours later without any modifications.
I recently got this problem. I've been using the same script for 3+ years and it suddenly stopped working. The above solutions didn't work for me. After contacting google here's what solved the issue (note it can take a few hours for the changes to propagate - up to 24 hours but usually not that long)
ALLOW low secure apps in Google settings (no effect on own but may be related to the full solution)
Try the unlock captcha link: https://accounts.google.com/DisplayUnlockCaptcha (no effect on its own but may be related to the full solution)
Admin Console > Apps > G Suite > Gmail > User Settings > Confidential Mode --> DISABLE Confidential Mode
Admin Console > Apps > G Suite > Gmail > End User Access --> TURN ON "Allow per-user outbound gateways"
来源：https://stackoverflow.com/questions/54657006/smtpauthenticationerror-5-7-14-please-log-n5-7-14-in-via-your-web-browser