Hi I'm having a little poblem here:
When I do the quest of the love letter in Vivec's Hlaalu canton, it doesnt' end, and is still in my journal.

Since the time I refused to bring the one girl the love potion and offered this guy to try with her cousin, nothing happens, I don't get any journalentry. There are also no new dialogue options, I talked to all 3 people, the guy, the girl and the girl's cousin, but for no use.
Do I have to wait perhaps? I don't want that quest to be open in my journal, I didn't find it in the list in the pinned Topic, so it can be done, I assume.

BTW: I think I've done all quests in Bloodmoon and Tribunal by now, I can't find any more after all and so I'm trying to do all the misceallenous quests in Morrowind. Is there a good and hopefully complete list for all quests?

You shouldn't have accepted the love potion- you should have convinced him that she was too much for her, and to look for the lady's cousin in the Elven Nations cornerclub. She WILL accept him, and, some time later, you can reenter his shop to find her there. He will then award you with a Flamemirror Robe.

Er... Cmac. That's exactly what he did, minus the happy ending.

Go into the general goods shop and run this through the console:

Glathel->PositionCell 175.85 -134.169 -157.704 270 "Vivec, Hlaalu General Goods"

He must have edited- I don't think he mentioned the cousin at all before.