Unbelievable! I've found a solution. It is very tricky. I'll try to explain it, but my language for google is german, so it is only a try to translate it.1. You have to allow pop3 and/or imap in your google account under the tab "forwarding and pop/imap".2. You have to allow insecure apps:https://myaccount.google.com/Here you see also the error messages from google.3. You have to activate your insecure websitehttps://accounts.google.com/b/0/DisplayUnlockCaptchaBut pay attention that you are logged in with the correct google account, before you do this. You can't check this on the above site.After that, I was successful.Pop3: 995 SSLImap: 993 SSLSMTP: 25, Auth yesGmail is a very popular mail provider. Other products do a lot to support it. The way osTicket is working with it is not very well documented or supported by the program itself. What google is doing here is a good thing to make the internet a little bit more secure. CiaoPeter