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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Matt's FormMail is a customizable form to email perl script which unlike most other formmail scripts that I have seen or used, it handles its own SMTP procedures, contacting the SMTPserver manually and hence removing the need for a program such as blat/
The webmail project supports one common web mail system that can simply be deployed with apache+php environment running on linux platform,and support any of the standard pop/smtp mail server.