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@type to: L{list} of L{str}
@ivar to: The addresses to which to deliver this message.
@type sender: L{str}
@ivar sender: The address from which this message is being sent.
@type body: C{file}
@ivar body: The object from which the message is to be read.
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@ivar allowUIDs: A list of UIDs which are allowed to send mail.
@ivar allowGIDs: A list of GIDs which are allowed to send mail.
@ivar denyUIDs: A list of UIDs which are not allowed to send mail.
@ivar denyGIDs: A list of GIDs which are not allowed to send mail.
@type defaultAccess: L{bool}
@ivar defaultAccess: L{True} if access will be allowed when no other access
control rule matches or L{False} if it will be denied in that case.
@ivar useraccess: Either C{'allow'} to check C{allowUID} first
or C{'deny'} to check C{denyUID} first.
@ivar groupaccess: Either C{'allow'} to check C{allowGID} first or
C{'deny'} to check C{denyGID} first.
@ivar identities: A L{dict} mapping hostnames to credentials to use when
sending mail to that host.
@ivar smarthost: L{None} or a hostname through which all outgoing mail will
be sent.
@ivar domain: L{None} or the hostname with which to identify ourselves when
connecting to an MTA.
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