American Express cardholders are asked never to click on a link in an email message to access to their accounts. They should instead, go directly to American Express website (www.americanexpress.com) and sign into their accounts from there. If there is something wrong or there is something that they need to with their accounts or cards, they will be notified after signing in.
The "American Express Miracle Gro Systems Maintenance Services" Scam
From: American Express firstname.lastname@example.org]
Sent: Wednesday, October 4, 2017 10:39 AM
Subject: Systems Maintenance Services.
We are letting you know that due to an ongoing General system maintenance in our Online Banking Database its mandatory for you to Verify Your American Express Account in order to enjoy our online banking service. We request that you complete this quick Verification process. If this is not done as urgent as possible your account might be deactivated at once.
Thanks for your understanding as we are always there to keep you informed