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.
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MongoDB Atlas runs apps anywhere
Deploy in 115+ regions with the modern database for every enterprise.
MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
This allows you to run an email "server" that will accept any and all emails and allow you to query them afterwards - similar to the service Mailinator.com provides.
Using this, you can test whether your applications can send emails correctly, and you can retrieve the data out of them (for example if you need to verify that account activation links exist in the outgoing email, and that they work correctly).
The real Mailinator service is better if you are only sending a one-off email....
JXchange is an mail server multiplataform, written in Java language, like MS-Exchange. This project includes SMTP server, POP3 server, IMAP server, web management interface and webmail designed to run in almost all OS.
Jsmtpd : A small and modular smtp email server daemon, written in Java. Jsmtpd is heavily based on plugins, and supports : spam detection (Spamassassin, Jasen, RBL servers, BlackList), anti virus (Clam Antivirus), and many others filters.
SIMON is a very simple MTA and POP3 implementation. It is completely designed from the ground up and is useful for departmental or small to medium sized companies.
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