Part of twisted.mail View Source
Today, internet e-mail has stopped being Peer-to-peer for many problems, spam (unsolicited bulk mail) among them. Instead, most nodes on the internet send all e-mail to a single computer, usually the ISP's though sometimes other schemes, such as SMTP-after-POP, are used. This computer is supposedly permanently up and traceable, and will do the work of figuring out MXs and connecting to them. This kind of configuration is usually termed "smart host", since the host we are connecting to is "smart" (and will find MXs and connect to them) rather then just accepting mail for a small set of domains.
The classes here are meant to facilitate support for such a configuration for the twisted.mail SMTP server
| Class | ManagedRelayerMixin | SMTP Relayer which notifies a manager |
| Class | SMTPManagedRelayer | No class docstring; 1/1 methods documented |
| Class | ESMTPManagedRelayer | No class docstring; 1/1 methods documented |
| Class | SMTPManagedRelayerFactory | No class docstring; 1/3 methods documented |
| Class | ESMTPManagedRelayerFactory | Undocumented |
| Class | Queue | A queue of ougoing emails. |
| Class | SmartHostSMTPRelayingManager | Manage SMTP Relayers |
| Class | SmartHostESMTPRelayingManager | Undocumented |
| Function | RelayStateHelper | Undocumented |
| Class | CanonicalNameLoop | When trying to look up the MX record for a host, a set of CNAME records was found which form a cycle and resolution was abandoned. |
| Class | CanonicalNameChainTooLong | When trying to look up the MX record for a host, too many CNAME records which point to other CNAME records were encountered and resolution was abandoned. |
| Class | MXCalculator | A utility for looking up mail exchange hosts and tracking whether they are working or not. |
| Class | _AttemptManager | Manage the state of a single attempt to flush the relay queue. |
| Function | _checkState | Undocumented |