| Instance Variables | allowUIDs | A list of UIDs which are allowed to send mail.
 | 
 | allowGIDs | A list of GIDs which are allowed to send mail.
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 | denyUIDs | A list of UIDs which are not allowed to send mail.
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 | denyGIDs | A list of GIDs which are not allowed to send mail.
 | 
 | defaultAccess | True if access will be allowed when no other access control
rule matches or False if it will be denied in that case.
 (type: bool
) | 
 | useraccess | Either 'allow' to check allowUID first or 
'deny' to check denyUID first.
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 | groupaccess | Either 'allow' to check allowGID first or 
'deny' to check denyGID first.
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 | identities | A dict mapping hostnames to credentials to use when sending
mail to that host.
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 | smarthost | None or a hostname through which all outgoing mail will be 
sent.
 | 
 | domain | None or the hostname with which to identify ourselves when 
connecting to an MTA.
 |