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JAmes Ldap List Server. A mailet for the Apache James email server which enables your existing groups in an LDAP directory to be mailed as though they are mailing lists.
PIWI is a java based system for managing subscribers and mailinglists and sending newsletters. It runs as webapplication (war) or as standalone application for your desktop, with embedded database (hsql) and webserver. You can use it also per commandline
An easy to use, scalable, extendible mailing list manager created in PHP. Has user management, job queuing and staggering. Uses ADODb Lite access layer for fast effecient access to your database, (currently only MySQL support included).
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Java based mailing list software with features for both statistical and rule based filtering of messages. The purpose is to create an easily extendable system that can be modified to suit the specific needs of the list provider.
JEM is an SMTP server with pluggable components that let you
process email in any way you like. It can also extend beyond
emails into generalised message processing (like JMS) and can
even generate its own messages based on a Cron-like facility.
Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
Ichabod is an SMTP/POP3 server, with mailing list support. Administration is via a web, or email
You can also use Ichabod to make your app receive email as an SMTP server.
You can also easily extend it by subclassing to add your own behaviors.