Overview of postman’s architecture


Postman has been designed following a multi-component structure. There is a daemon that manage the mailing lists and members information in a storage backend and there are different kinds of clients (currently, three of them) that interact with the daemon using a XMLRPC link.

This is the scheme of the architecture:

Scheme of the architecture behind Postman

Postman daemon

The daemon will perform all the operations regarding the management of the mailing lists and members. The daemon will save information of a given mailing list to the storage backend, and will read information of already saved lists from there too.

It listens for incoming XMLRPC requests on a given tcp port, allowing clients to add/update/delete data from the backend.

MTA client

This client is attached to a given MTA, and is called but the MTA itself when emails for a mailing lists are received. The client performs some checks on the backend to tell the MTA what it has to do with the incoming emails.

CLI client

This is a shell-like interface that can be used to add mailing lists to a given Postman server, edit such mailing lists information, add members, etc.

Web client

This is a small webapp that can be used to perform the same management operations you can achieve using the CLI client.

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