The question is specific to gmail business/ educational accounts. In order to read emails from a gmail account i have written a dll in c++ which executes IMAP commands and then parses their responses. With the current IMAP implementation i need to login to each users mailbox with his username and password information. So i was wondering if there is any option in gmail business with which i can login to multiple users in a domain with single admin users credentials and without to need to get password from each indivdual user in the domain?
You could create a Service Account in the Google Developers Console and give it access to the Email scope for the domain. Whenever you want to access a mailbox, you'd obtain an access token (which can be cached for up to an hour) and then use it with the XOAUTH2 SASL for authentication.