> Bridge is open source, and as a result relies upon open-source components

I don't get it. Bridge is open source does not imply it should relies upon open-source components.

> Addressing this issue at the source requires replacing the core IMAP library.

Why building an IMAP library from scratch instead of fixing/forking go-imap? Even a temporary fix to go-imap when you are developing gluon? Another repetitive work which does not guarantee the mentioned issues will be resolved completely.