Someone emails you about the item you are selling as an auction only.
They offer you a price to end it early,ask yourself these questions.
1. Is it a fair price?
2. If the item is part of a lot,why are they asking you to sell it separate?
3. Also with the 2nd question if they found your listing and ask you to sell part of your lot,how did they come across it(surely they would be doing a search for that particular item separately?)
4. Why do they want it?
After asking yourself these questions,do the following.
1. Check the persons feedback and see if they have any items for sale.
2. Do a completed items search for your item,see how much is a good price.
I hope this helps at least one person.