real time notifications

Hey everyone, I’ve noticed that on Thunderbird for Android, some of my email accounts get new messages with a delay of up to 15 minutes. I’d really like to get them '''instantly''' (or at least much faster). A few details: - The email server is my university’s, so it might not have the latest sync features. - I set the folder poll frequency to 15 minutes, and emails do come through fine that way — just too slow. - I also set “refresh IDLE connection” to every 2 minutes. - Running version 13.0 of Thunderbird on Android. Is there any way to make Thunderbird fetch or push emails instantly? Or is this delay just how it works if the mail server doesn’t fully support push/IDLE? Thanks for any tips or ideas!