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La API de correo electrónico proporciona dos formas de enviar un mensaje de correo electrónico: la función mail.send_mail() y la clase EmailMessage.
El envío es asíncrono: la función mail.send_mail() y el método EmailMessage.send() transmiten los datos del mensaje al servicio de correo electrónico y, luego, los muestra. El servicio de correo electrónico pone en cola el mensaje, luego, intenta enviarlo y vuelve a intentarlo si el servidor de correo de destino no está disponible. Los errores y los mensajes de rebote se envían a la dirección del remitente para el mensaje de correo electrónico.
Antes de comenzar
Debes registrar los correos electrónicos de tus remitentes como remitentes autorizados. Para obtener más información, consulta Quiénes pueden enviar correos electrónicos.
Envía correos electrónicos con mail.send_mail()
Para enviar correos electrónicos mediante la función mail.send_mail(), usa los campos del mensaje de correo electrónico como parámetros, incluidos el remitente, los destinatarios, el asunto y el cuerpo del mensaje. Por ejemplo:
mail.send_mail(sender=sender_address,to="Albert Johnson <Albert.Johnson@example.com>",subject="Your account has been approved",body="""Dear Albert:Your example.com account has been approved. You can now visithttp://www.example.com/ and sign in using your Google Account toaccess new features.Please let us know if you have any questions.The example.com Team""")
Envía correos electrónicos con EmailMessage
Para enviar correos electrónicos mediante objetos con la clase EmailMessage, pasa los campos del mensaje de correo electrónico al constructor EmailMessage y usa los atributos de la instancia a fin de actualizar el mensaje.
El método EmailMessage.send() envía el mensaje de correo electrónico representado por los atributos de la instancia. En una aplicación, se puede volver a usar una instancia EmailMessage si se modifican los atributos y se llama de nuevo al método send().
message=mail.EmailMessage(sender=sender_address,subject="Your account has been approved")message.to="Albert Johnson <Albert.Johnson@example.com>"message.body="""Dear Albert:Your example.com account has been approved. You can now visithttp://www.example.com/ and sign in using your Google Account toaccess new features.Please let us know if you have any questions.The example.com Team"""message.send()
En el siguiente ejemplo, se demuestra el envío de un mensaje para confirmar una dirección de correo electrónico:
classUserSignupHandler(webapp2.RequestHandler):"""Serves the email address sign up form."""defpost(self):user_address=self.request.get('email_address')ifnotmail.is_email_valid(user_address):self.get()# Show the form again.else:confirmation_url=create_new_user_confirmation(user_address)sender_address=('Example.com Support <{}@appspot.gserviceaccount.com>'.format(app_identity.get_application_id()))subject='Confirm your registration'body="""Thank you for creating an account!Please confirm your email address by clicking on the link below:{}""".format(confirmation_url)mail.send_mail(sender_address,user_address,subject,body)
[[["Fácil de comprender","easyToUnderstand","thumb-up"],["Resolvió mi problema","solvedMyProblem","thumb-up"],["Otro","otherUp","thumb-up"]],[["Difícil de entender","hardToUnderstand","thumb-down"],["Información o código de muestra incorrectos","incorrectInformationOrSampleCode","thumb-down"],["Faltan la información o los ejemplos que necesito","missingTheInformationSamplesINeed","thumb-down"],["Problema de traducción","translationIssue","thumb-down"],["Otro","otherDown","thumb-down"]],["Última actualización: 2025-09-04 (UTC)"],[[["\u003cp\u003eThe mail API offers two methods for sending emails: the \u003ccode\u003email.send_mail()\u003c/code\u003e function and the \u003ccode\u003eEmailMessage\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003eEmail sending is asynchronous, meaning the function or method returns immediately after sending the message data to the mail service, which then queues and attempts delivery.\u003c/p\u003e\n"],["\u003cp\u003eTo use this API you need to register your sender emails as authorized senders.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003email.send_mail()\u003c/code\u003e function takes email fields as parameters, whereas the \u003ccode\u003eEmailMessage\u003c/code\u003e class uses attributes of an instance to construct and send emails.\u003c/p\u003e\n"],["\u003cp\u003eThis API can only run in first-generation runtimes in the App Engine standard environment.\u003c/p\u003e\n"]]],[],null,["# Sending Mail\n\nThe mail API provides two ways to send an email message: the\n[`mail.send_mail()`](/appengine/docs/legacy/standard/python/refdocs/google.appengine.api.mail#google.appengine.api.mail.send_mail) function and the [`EmailMessage`](/appengine/docs/legacy/standard/python/refdocs/google.appengine.api.mail#google.appengine.api.mail.EmailMessage) class.\n| This page describes how to use the legacy bundled services and APIs. This API can only run in first-generation runtimes in the App Engine standard environment. If you are updating to the App Engine Python 3 runtime, refer to the [migration guide](/appengine/migration-center/standard/migrate-to-second-gen/python-differences) to learn about your migration options for legacy bundled services.\n\nSending is asynchronous: the `mail.send_mail()` function and the\n`EmailMessage.send()` method transmit the message data to the mail\nservice, then return. The mail service queues the message, then attempts to\nsend it, retrying if the destination mail server is unavailable. Errors and\nbounce messages are sent to the sender address for the email message.\n\nBefore you begin\n----------------\n\nYou must register your sender emails as authorized senders. For more\ninformation, see\n[who can send email](/appengine/docs/legacy/standard/python/mail#who_can_send_mail).\n\nSending mail with `mail.send_mail()`\n------------------------------------\n\nTo send mail using the [`mail.send_mail()`](/appengine/docs/legacy/standard/python/refdocs/google.appengine.api.mail#google.appengine.api.mail.send_mail) function, use the fields of the\nemail message as parameters, including the sender, the recipients, the subject\nand the body of the message. For example: \n\n mail.send_mail(sender=sender_address,\n to=\"Albert Johnson \u003cAlbert.Johnson@example.com\u003e\",\n subject=\"Your account has been approved\",\n body=\"\"\"Dear Albert:\n\n Your example.com account has been approved. You can now visit\n http://www.example.com/ and sign in using your Google Account to\n access new features.\n\n Please let us know if you have any questions.\n\n The example.com Team\n \"\"\")\n\nSending mail with `EmailMessage`\n--------------------------------\n\nTo send mail using objects with the\n[`EmailMessage`](/appengine/docs/legacy/standard/python/refdocs/google.appengine.api.mail#google.appengine.api.mail.EmailMessage) class, pass the fields of the email message to\nthe EmailMessage constructor and use attributes of the instance to update\nmessage.\n\nThe [`EmailMessage.send()`](/appengine/docs/legacy/standard/python/refdocs/modules/google/appengine/api/mail#EmailMessage) method sends the email message\nrepresented by the instance's attributes. An application can re-use an\n`EmailMessage` instance by modifying attributes and calling the `send()` method\nagain. \n\n message = mail.EmailMessage(\n sender=sender_address,\n subject=\"Your account has been approved\")\n\n message.to = \"Albert Johnson \u003cAlbert.Johnson@example.com\u003e\"\n message.body = \"\"\"Dear Albert:\n\n Your example.com account has been approved. You can now visit\n http://www.example.com/ and sign in using your Google Account to\n access new features.\n\n Please let us know if you have any questions.\n\n The example.com Team\n \"\"\"\n message.send()\n\nThe following example demonstrates sending a message to confirm an email\naddress: \n\n class UserSignupHandler(webapp2.RequestHandler):\n \"\"\"Serves the email address sign up form.\"\"\"\n\n def post(self):\n user_address = self.request.get('email_address')\n\n if not mail.is_email_valid(user_address):\n self.get() # Show the form again.\n else:\n confirmation_url = create_new_user_confirmation(user_address)\n sender_address = (\n 'Example.com Support \u003c{}@appspot.gserviceaccount.com\u003e'.format(\n app_identity.get_application_id()))\n subject = 'Confirm your registration'\n body = \"\"\"Thank you for creating an account!\n Please confirm your email address by clicking on the link below:\n\n {}\n \"\"\".format(confirmation_url)\n mail.send_mail(sender_address, user_address, subject, body)\n\nSending bulk mail\n-----------------\n\nSee the [Bulk mail guidelines](/appengine/docs/legacy/standard/python/mail/bulk-mail) for considerations around sending bulk\nemail."]]