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The timeline is not off. If you pay a credit card on the due date they don't get the money instantly. You get credit the day it's made contingent on the payment clearing. This is no different.
Second, so what if it's a foreign call center? Half the time I call for my Delta cards it goes to a foreign call center.
Lastly, amex confirmed the info is attached to your collections account. Not sure what else you need from them to confirm it's legit. In the last 4 days amex has sent me emails from 4 different addresses. It's normal for a business.

Thank you so much for sharing these. It makes me feel less worried. Today I checked my bank, they took the settlement amount, but I haven't received a confirmation email like they promised they would when they process the payment. I still keep receiving invitation emails from them about settling the debt now or pay in full.
Legit..Amex..
Hey, I have also been recieving these emails and just wanted to follow up and see if this ended up being legit?
thank you!
@icloud987 @I messaged above but forgot to tag you, just wanted to know if this ended up being legitimate?
thanks!
It sounds like a legitimate collection to me.
@Hellohellosmilesmile Morning , yes , it was legit .
[email protected] is not a legit American Express email per their website:
https://www.americanexpress.com/us/security-center/phishing-scam-awareness/
This is most likely a scam.