Here are the classes:

..currentmodule::email.mime.base

..module::email.mime.base

..class::MIMEBase(_maintype, _subtype, *, policy=compat32, **_params)

Added *policy* keyword-only parameter.

..currentmodule::email.mime.nonmultipart

..module::email.mime.nonmultipart

..class::MIMENonMultipart()

is called, a:exc:`~email.errors.MultipartConversionError` exception is raised.

..currentmodule::email.mime.multipart

..module::email.mime.multipart

..class::MIMEMultipart(_subtype='mixed', boundary=None, _subparts=None, \

*, policy=compat32, **_params)

..versionchanged::3.6

Added *policy* keyword-only parameter.

..currentmodule::email.mime.application

..module::email.mime.application

..class::MIMEApplication(_data, _subtype='octet-stream', \

_encoder=email.encoders.encode_base64, \

..versionchanged::3.6

Added *policy* keyword-only parameter.

..currentmodule::email.mime.audio

..module::email.mime.audio

..class::MIMEAudio(_audiodata, _subtype=None, \

_encoder=email.encoders.encode_base64, \

..versionchanged::3.6

Added *policy* keyword-only parameter.

..currentmodule::email.mime.image

..module::email.mime.image

..class::MIMEImage(_imagedata, _subtype=None, \

_encoder=email.encoders.encode_base64, \

..versionchanged::3.6

Added *policy* keyword-only parameter.

..currentmodule::email.mime.message

..module::email.mime.message

..class::MIMEMessage(_msg, _subtype='rfc822', *, policy=compat32)

..versionchanged::3.6

Added *policy* keyword-only parameter.

..currentmodule::email.mime.text

..module::email.mime.text

..class::MIMEText(_text, _subtype='plain', _charset=None, *, policy=compat32)

Doc/library/email.charset.rst

Doc/library/email.compat32-message.rst

Doc/library/email.errors.rst

Doc/library/email.mime.rst

Doc/library/email.parser.rst

Doc/library/email.policy.rst

Doc/library/enum.rst