I got a mail from "Amos" to invite me to a ceremony in Ammer, I went there then I had to speak with professor, which I didn't know where they are, so I went to complete my other quests to level up.
I was out of quests so I checked if I had any with that search thingy, I clicked it and it showed the Ammer one, all of the sudden, I found out that it was somehow abandoned (I don't recall abandoning it)
I checked from where I got the quest, saw that it was from that mail, but the letter wasn't in my back, it's gone, and I don't know how to get it back, if there's a way please let me know.