twisted.mail.interfaces.IAliasableDomain

Method	`exists`	Check whether a user exists in this domain or an alias of it.
Method	`setAliasGroup`	Set the group of defined aliases for this domain.

Inherited from IDomain:

Method	`addUser`	Add a user to this domain.
Method	`getCredentialsCheckers`	Return credentials checkers for this domain.

def exists(user, memo=None): (source)

overrides twisted.mail.interfaces.IDomain.exists

Check whether a user exists in this domain or an alias of it.

Parameters
user:`User`	A user.
memo:`None` or `dict` of `AliasBase`	A record of the addresses already considered while resolving aliases. The default value should be used by all external code.
Returns
no-argument callable which returns `IMessageSMTP` provider	A function which takes no arguments and returns a message receiver for the user.
Raises
`SMTPBadRcpt`	When the given user does not exist in this domain or an alias of it.

def setAliasGroup(aliases): (source)

Set the group of defined aliases for this domain.

Parameters
aliases:`dict` of `bytes` -> `IAlias` provider	A mapping of domain name to alias.