mailgate is a set of Python scripts we used at my former company to transfer email a) from a POP3 account to our internal mail server, b) from a POP3 account to a mailbox file and c) from a mailbox file to a SMTP server.
JEEPERS (Jason's Extra Easy to Program Email Response System) uses a POP3 email account to monitor email for command phrases in subject lines. Default commands for remote file storeage and retrival. (Nothing to do with mailing lists or mass emailing.)
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.
Monty's Postcard Server is an CGI application written in Python that makes putting up a Postcard Server a breeze. The only thing the Admin has to do is to supply the Images. Everything is configurable of cause!
Mailchecker will (in time) check mail for 'safe' content. 'unsafe' content (e.g. attachments that may contain viruses) will be stopped or converted to 'safe' formats.