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py3-validate-email
============================

py3-validate-email is a package for Python that check if an email is valid, not blacklisted, properly formatted and really exists.

This module is for Python 3.6 and above!

INSTALLATION
============================

You can install the package with pip::

    python -m pip install py3-validate-email


USAGE
============================

Basic usage::

    from validate_email import validate_email
    is_valid = validate_email(email_address='example@example.com', check_regex=True, check_mx=True, from_address='my@from.addr.ess', helo_host='my.host.name', smtp_timeout=10, dns_timeout=10, use_blacklist=True, debug=False)

:code:`check_regex` will check will the email address has a valid structure and defaults to True

:code:`check_mx`: check the mx-records and check whether the email actually exists

:code:`from_address`: the email address the probe will be sent from

:code:`helo_host`: the host to use in SMTP HELO when checking for an email

:code:`smtp_timeout`: seconds until SMTP timeout

:code:`dns_timeout`: seconds until DNS timeout

:code:`use_blacklist`: use the blacklist of domains downloaded from https://github.com/martenson/disposable-email-domains

:code:`debug`: emit debug/warning messages while checking email

:code:`skip_smtp`: (default :code:`False`) skip the SMTP conversation with the server, after MX checks. Will automatically be set to :code:`True` when :code:`check_mx` is :code:`False`!

The function :code:`validate_email_or_fail()` works exactly like :code:`validate_email`, except that it raises an exception in the case of validation failure and ambiguous result instead of returning :code:`False` or :code:`None`, respectively.

The module will try to negotiate a TLS connection with STARTTLS, and silently fall back to an unencrypted SMTP connection if the server doesn't support it.

Auto-updater
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The package contains an auto-updater for downloading and updating the built-in blacklist.txt. It will run on each module load (and installation), but will try to update the content only if the file is older than 5 days, and if the content is not the same that's already downloaded.

The update can be triggered manually::

    from validate_email.updater import update_builtin_blacklist

    update_builtin_blacklist(force: bool = False, background: bool = True,
        callback: Callable = None) -> Optional[Thread]

:code:`force`: forces the update even if the downloaded/installed file is fresh enough.

:code:`background`: starts the update in a ``Thread`` so it won't make your code hang while it's updating. If you set this to true, the function will return the Thread used for starting the update so you can ``join()`` it if necessary.

:code:`callback`: An optional `Callable` (function/method) to be called when the update is done.

Read the FAQ_!
============================
.. _FAQ: https://github.com/karolyi/py3-validate-email/blob/master/FAQ.md