(edited by Kururu.8140)
No mail after completing HoT
You may have to wait till after reset. That’s my best guess anyway.
^ what he/she/it said
Have you tried going to the Grove, anyway? Speaking to the NPC there may start the ‘quests’, regardless.
Good luck.
I just finished HoT, it went smoothly, I didn’t get any mail but when I checked the npc at the grove she had a green star above her, and then I just carried on with the quest from there. So you don’t need to wait for the reset.