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Asked: 2026-05-23T15:50:59+00:00

I wrote a sample code to send email from google app engine in Python.

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I wrote a sample code to send email from google app engine in Python. I’m not able to figure out why is it sending out every mail twice?

mail.py:-

from google.appengine.api import mail

mail.send_mail(sender="ALPHA <ALPHA@gmail.com>",
        to="BETA <BETA@hotmail.com>",
        subject="test mail",
        body="""

Dear BETA,
How have you been?

Regards,
ALPHA
""")

app.yaml:-

application: MyUniqueAppID
version: 1
runtime: python
api_version: 1

handlers:
- url: .*
script: mail.py
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1 Answer

  1. Editorial Team

    If that really is your app.yaml, then any request to your app is going to result in a mail being sent.

    If you visit the site with a web-browser, it will first make a request for /, then probably also make a request for /favicon.ico and potentially other unintended requests. Each resulting in a mail being sent.

    You should:

    1. Make your url route in app.yaml more specific than .*
    2. Not just place your code directly in the module scope as you appear to have done for mail.py. Modules can get cached and although this will work, it might not work like that forever, so use the webbapp framework to create a propper application/handler within mail.py
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