class MailIntakeError(Exception):
    """
    Base exception for all mail-intake errors.

    Users of the library should catch this type (or subclasses)
    instead of provider-specific or third-party exceptions.
    """


class MailIntakeAuthError(MailIntakeError):
    """Authentication and credential-related failures."""


class MailIntakeAdapterError(MailIntakeError):
    """Errors raised by mail provider adapters."""


class MailIntakeParsingError(MailIntakeError):
    """Errors encountered while parsing message content."""