Send mail GitHub Action

An action that simply sends a mail to multiple recipients.

Some features:

plain text body
HTML body
multipart body (plain text + HTML)
Markdown to HTML converting (use html_body, not body)
file attachments (supports globbing)

Usage

- name: Send mail
  uses: dawidd6/action-send-mail@v4
  with:
    # Specify connection via URL (replaces server_address, server_port, secure,
    # username and password)
    #
    # Format:
    #
    #  * smtp://user:password@server:port
    #  * smtp+starttls://user:password@server:port
    connection_url: ${{secrets.MAIL_CONNECTION}}
    # Required mail server address if not connection_url:
    server_address: smtp.gmail.com
    # Server port, default 25:
    server_port: 465
    # Optional whether this connection use TLS (default is true if server_port is 465)
    secure: true
    # Optional (recommended) mail server username:
    username: ${{secrets.MAIL_USERNAME}}
    # Optional (recommended) mail server password:
    password: ${{secrets.MAIL_PASSWORD}}
    # Required mail subject:
    subject: Github Actions job result
    # Required recipients' addresses:
    to: obiwan@example.com,yoda@example.com
    # Required sender full name (address can be skipped):
    from: Luke Skywalker # <user@example.com>
    # Optional plain body:
    body: Build job of ${{github.repository}} completed successfully!
    # Optional HTML body read from file:
    html_body: file://README.html
    # Optional carbon copy recipients:
    cc: kyloren@example.com,leia@example.com
    # Optional blind carbon copy recipients:
    bcc: r2d2@example.com,hansolo@example.com
    # Optional recipient of the email response:
    reply_to: luke@example.com
    # Optional Message ID this message is replying to:
    in_reply_to: <random-luke@example.com>
    # Optional unsigned/invalid certificates allowance:
    ignore_cert: true
    # Optional converting Markdown to HTML (set content_type to text/html too):
    convert_markdown: true
    # Optional attachments:
    attachments: attachments.zip,git.diff,./dist/static/*.js
    # Optional priority: 'high', 'normal' (default) or 'low'
    priority: low
    # Optional nodemailerlog: true/false
    nodemailerlog: false
    # Optional nodemailerdebug: true/false if true lognodem will also be set true
    nodemailerdebug: false

Troubleshooting

Gmail

Instead of using your normal Google password, use an App password.

Enable 2-Step Verification.. This is needed to create an App password.
Create an App password for Mail.

Unauthenticated login (username/password fields)

The parameters username and password are set as optional to support self-hosted runners access to on-premise infrastructure. If you are accessing public email servers make sure you provide a username/password authentication through GitHub Secrets to make the email delivery secure.