secure-email 1.0.4

This project allows sending STMP email over TLS using SSL.

SSL Email

Table of Contents

• Project Description
• Installation
• Setup
• Usage

Project Description

This project allows sending STMP email over TLS using SSL. Use the Emailer class to create an instance for an outgoing email account, and call the send method to send an email. You can also use the EmailHandler class to add a custom email handler to your app's logger.

Installation

python -m pip install secure-email

Setup

Keyring

The keyring library stores credentials in your machine's Windows Credential Locker. If you wish to make use of the Emailer class' use_keyring argument, make sure you have the keyring library installed:

pip install keyring

To use keyring to fetch the password in the Emailer class, use the email address associated with the credentials as the name:

keyring.set_password(
  "[e-mail]",
  "[e-mail]",
  "supersecretpassword"
)

Usage

from secure_email import Emailer

Files in the demo folder demonstrate how to use the two classes in this project--Emailer and EmailHandler. send_email.py demonstrates how to send an email from a python script, and the flask_app demonstrates how to add the EmailHandler to you app's logger. The Emailer and EmailHandler classes are both located in sendmail.py in the src folder.

Emailer

Class for sending emails. Instantiating a class merely stores the info to create an STMP connection, while calling the send method creates the STMP connection, sends an email, and then closes the connection.

• Arguments:

  • secure_host (str): default SSL-enabled mail host
  • port (int): port number for mail host
  • email_address (str): "from" email address
  • password: (str | None): email password (default: None)
  • user: (str | None): username for server, if different than email address
  • unsecure_host: (str | None): backup non-SSL mail host
  • use_keyring (bool): whether to fetch password from keyring (default: False)
  • include_ssl_status (bool): whether to add line to body of sent emails indicating whether email was sent over SSL (default: False)

• Methods:

  • send
    • Sends STMP email
    • Arguments:
      • to (str|list[str]): email recipient(s)
      • subject (str): email subject line
      • body (str): body of email as text or HTML string
      • attachments (list[str]|list[iter[str]]): list of paths to files to attach to email. Can supply 2-length list or tuple of (path, encoding) to specify which encoding to use for an attachment, if other than UTF-8 (default: [])
      • ignore_attachment_errors (bool): whether to ignore errors when adding attachments. If True, attached files will send with invalid characters excluded. If False, files with any invalid characters will throw error. (default: True)
      • cc_list (list[str]): recipients to CC (default: [])
      • bcc_list (list[str]): recipients to BCC (default: [])
      • html (bool): whether to send body as HTML (default: False)
      • secure (bool): whether to send over SSL (default: True)
    • Returns:
      • response (str): either "success" or error message

• Example:

  # Supply password directly
  emailer = Emailer(
      "my.emailserver.com",  # host
      0,  # port
      "[e-mail]",  # email_address
      password="supersecretpassword"
  )
  
  # Use password stored in keyring
  emailer = Emailer(
      "my.emailserver.com",  # host
      0,  # port
      "[e-mail]",  # email_address
      use_keyring=True
  )
  
  response = emailer.send(
      "[e-mail]",  # to
      "Open Immediately!!!",  # subject
      "You may have won $1,000,000. Click the link below to find out",  # body
  )
  successful = response == "success"
  

EmailHandler

Extends logging.handlers.SMTPHandler to use the Emailer class to send emails (see the logging library documentation to learn more about the SMTPHandler). EmailHandler makes the following modifications to SMTPHandler:

• Modified arguments:

  • subject: (str | None): required in SMTPHandler, but optional in EmailHandler in case subject formatter is used instead; note that failing to provide a subject string or add a subject formatter will result in emails being sent with no subject

• Additional arguments:

  • send_html (bool): whether to send HTML email instead of plain text (default: False)
  • backup_host (str | None): non-SSL host to send from if SSL host fails
  • include_ssl_status (bool): whether to add line to body of sent emails indicating whether email was sent over SSL default: False)

• Additional methods:

  • setSubjectFormatter: sets formatter to use for record-based subject line
    • Params:
      • fmt (logging.Formatter)