twisted.mail.relaymanager.SmartHostSMTPRelayingManager._ebExchange(self, failure, factory, domain) method documentationtwisted.mail.relaymanager.SmartHostSMTPRelayingManager
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      Prepare to resend messages later.
This errback function runs when no mail exchange server for the domain can be found.
| Parameters | failure | The reason the mail exchange lookup failed. (type: Failure) | 
| factory | A factory which can create a relayer for the mail exchange server. (type: SMTPManagedRelayerFactory) | |
| domain | A domain. (type: bytes) | 
| Function | setWaiting | Undocumented |