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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Bulk email sender run as windows background service
bulk email sender java
(1) Import emails form Excel file
(2) append more receiver's mails in the Excel file while the mailing program is still running.
(3) simultaneously/ in parallel start as many number of mailer-programs on my system as I want to.
(4) When mail is sent, the program should update Date and Time of sending of mail in another cell of the same Excel file
(6) Program hidden from everywhere. you can stop it form Task Manager" from Services/process list.