[stunnel-users] IMAP and SMTP user filtering

Hello all,

I rebuilt Stunnel from source (Ubuntu 20.040 and now I am trying to add user filtering for IMAP and SMTP protocols.

The purpose is following:

I have non-SSL device that does not have permanent IP address (connected to mobile internet and its IP may change any time). This device should connect to Stunnel running on the server in Internet (not local network) to receive email from Gmail account. To prevent abuse I have to allow only one user (let's say, [email protected]) to connect to my Stunnel instance.

Is it possible? What part of code should I modify?

Thank you