Prodigy Account being Closed due to version upgrade?

ve received two emails indication that my version needs to be updated. I feel this is phishing. Am I correct?:

Dear User,

Your Mail version is outdated.

Failure to Upgrade to the newest AT&T/Yahoo Mail 18.5.2 now will result to a permanent account closure.

To upgrade please open the Attachment to avoid service disruption.

Thanks,
AT&T/Yahoo! Mail Team

Sent by: prodigy.net Support <[email scrubbed]>
I do not recognize lginc.com

(edited)