Thank you soooo much for this info! I was getting desperate. I uninstalled Chrome updates, turned off auto-update, then rebooted. HTC Mail reply/reply all function now working again. For clarity, this is for an unlocked HTC-10 with the lastest Android 8.0 update package. Although the Android update was performed at least three weeks ago, the mail app only started to crash yesterday (at least as far as the first time I detected the crash behavior). This is the first real root cause solution I've found. Thanks again!