Deactivating account

Hello,

I keep receiving messages from AT&T stating they are deactivating my old account. The message is shown below

Dear user,

We are closing all old versions of our mail as of August 24th, 2023, p lease follow the link below to update your account :

CLICK HERE TO UPDATE NOW

Failure to do this will lead to permanent deactivation of your Account.

Is this a legitimate email source? The person sending this message is [email scrubbed]

Please help!