📩 myl-discovery

myl-discovery is a Python library designed to detect email settings of a given email address or domain.

📥 Installation

To install myl-discovery, run the following command:

pip install myl-discovery

📖 Usage

After installing the package, you can use the autodiscover function to discover the email settings for a domain. Here's an example:

from myldiscovery import autodiscover

settings = autodiscover("yourdomain.com")  # or me@yourdomain.com
print(settings)

# For Exchange autodiscovery you need to provide credentials
settings = autodiscover(
    'me@yourdomain.com',
    username='WORKGROUP\me',
    password='mypassword1234'
)

📄 Output

The autodiscover function returns a dictionary with the detected settings. The dictionary contains two keys, imap and smtp, each containing a dictionary with the keys server, port, and starttls.

Here's an example:

{
  "imap": {
    "server": "imap.yourdomain.com",
    "port": 993,
    "starttls": false,
    "ssl": false
  },
  "smtp": {
    "server": "smtp.yourdomain.com",
    "port": 587,
    "starttls": true,
    "ssl": false
  }
}

🧩 Autodiscover Functions

myl-discovery exposes several functions to discover email settings:

• autodiscover: This function wraps the below function do automatically detect the right settings. (See Autodiscover strategy for more information)
• autodiscover_srv: This function attempts to resolve SRV records for the domain to discover IMAP and SMTP servers.
• autodiscover_exchange: This function attempts to use the Exchange Autodiscover service to discover email settings. It requires a username and password.
• autodiscover_autoconfig: This function attempts to fetch and parse an autoconfig XML file from a URL specified in the domain's TXT records.
• autodiscover_port_scan: This function performs a port scan on the domain to discover open IMAP and SMTP ports.

🧠 Autodiscover Strategy

The autodiscover function uses the following strategy to discover email settings:

1. It first attempts to use autodiscover_autoconfig to discover settings from an autoconfig/autodiscover URL specified in the domain's TXT records.
2. If that fails, it attempts to use autodiscover_srv to discover settings from the domain's SRV records.
3. If that fails and a password is provided, it attempts to use autodiscover_exchange to discover settings using the Exchange Autodiscover service (only if credentials were provided)
4. If all else fails, it uses autodiscover_port_scan to discover settings by performing a port scan on the domain.

💻 CLI usage

If you do not intend to use the Python library and just want to detect the connection settings of an arbitrary email, myl-discovery also ships with a CLI tool.

📥 Installation

pipx install myl-discovery

📖 Usage

$ myl-discovery --help
usage: myl-discovery [-h] [-j] [-d] [-u USERNAME] [-p PASSWORD] EMAIL

positional arguments:
  EMAIL

options:
  -h, --help            show this help message and exit
  -j, --json
  -d, --debug
  -u USERNAME, --username USERNAME
                        Username (Exchange only)
  -p PASSWORD, --password PASSWORD
                        Password (Exchange only)

Example:

$ myl-discovery user01@gmail.com
 Service          Host                           Port       Encryption
 imap             imap.gmail.com                 993        tls
 smtp             smtp.gmail.com                 587        tls

📜 License

myl-discovery is licensed under the GNU General Public License v3.0.

📑 Upstream docs

• https://wiki.mozilla.org/Thunderbird:Autoconfiguration:ConfigFileFormat
• https://datatracker.ietf.org/doc/html/rfc6186
• https://developers.google.com/gmail/imap/imap-smtp