salihmei Not that I am aware of. The people over at osTicket have been working on this for over a year. You can try to see if there might be any on the internet, but I doubt it since the biggest things that I have seen the Developers post on here is that the Pear Libraries do not play nicely with OAuth2.0 which is why it took them so long to get this working since they had to rip the libraries out that they have been using for a long time and re-write the whole email function with new libraries. There is a post on the board somewhere where one of the developers explains in more detail of this.
I am still using 1.15.8 and am not affected since my implementation does not take/generate tickets by email.