Politer way to say "who are you?"

[WolfWay]

I just got a random FB message from someone I don't know at all, that said nothing other than "Good day".

I replied "Hello? Do I know you?".

Is that a bit rude? Is there a better way to ask "Who in flaming heck are you, mysterious stranger?"

[auntmeegs]

I think the way you asked was perfectly polite and appropriate. 

[Zizi-K]

Alternatively, "sorry do we know each other?" But what you wrote is excellent as well.

[WolfWay]

Got a supremely uninformative reply back of "Email me back at <email address>"
 
Yeah, scammer. Blocked.

I googled the email address and it's already listed as being for a known 419 scammer. I emailed the person listed as our mutual friend on FB and told him that if he did know the person, he should tell her she's been hacked. If he doesn't know the person, he should defriend her because it's a scammer's account.

[MorgnsGrl]

In the past, I've said, "Hi, sorry, who is this?" So far it's always been someone I actually did know and I just didn't have their number in my phone or whatever.

[VorFemme]

There's always the perfectly polite "I'm sorry, I'm drawing a blank on where/when we met?" or "I can't place your name...?"

These work fairly well unless it's your cousin at her step-dad's funeral...third marriage, I didn't recognize the last name...

Fortunately, she laughed & understood because it has been over twenty years since we saw each other much (I married a military man and she still was still in her twenties back then)!

[poundcake]

This is why I don't ever respond to emails that are little more than "Hi there!" or "Good morning." Always a scammer. Always.

But if you're a person who forgets names/faces or is just drawing a blank, like I do sometimes, in person I usually say "Forgive me, refresh my memory?" In email? I Google!

[Curly Wurly Doggie Breath]

Got a supremely uninformative reply back of "Email me back at <email address>"
 
Yeah, scammer. Blocked.

I googled the email address and it's already listed as being for a known 419 scammer. I emailed the person listed as our mutual friend on FB and told him that if he did know the person, he should tell her she's been hacked. If he doesn't know the person, he should defriend her because it's a scammer's account.

Yeh, I get a few of those and I think by this weeks count, they are doing the rounds again

[MrTango]

To be honest, I don't think "Who are you?" is rude in this case.  They contacted you and failed to identify themselves.

[veronaz]

A "Good day" on FB from a stranger is meaningless.  Since the other person initiated the contact and didn't identify themselves or say why they're contacting you, I'd delete, block, and forget it.  I wouldn't waste anymore time on it.

[Twik]

This is why I don't ever respond to emails that are little more than "Hi there!" or "Good morning." Always a scammer. Always.

Definite pod there. Real people say what they want in the first message, even if it's just "wanted to drop you a note to see how things are going."

[cicero]

A "Good day" on FB from a stranger is meaningless.  Since the other person initiated the contact and didn't identify themselves or say why they're contacting you, I'd delete, block, and forget it.  I wouldn't waste anymore time on it.

exactly.