This relay isn't allowed to send mail "From" me.com
Apple doesn’t allow other Mail servers to send Mail on their behalf for security reasons - only authenticated Mail clients can send. Since your VPS isn’t an Apple server, no one will accept your reply as if you were Apple sending that reply.

https://support.apple.com/guide/icloud/what-is-icloud-mail-mm6b1a17e3/icloud

Are you able to set up your me.com account on your Mail clients or use webmail with iCloud in the VPS?