Annoying: This mailbox is closed

Bah!

Silly vodafone is replying to any email sent to an @clear.net.nz email address with a reply that simply says

"This mailbox is closed"

Cant they just close the account and return the proper SMTP error code?

A customer's ticketing system now has several thousand tickets of back and forth replies of

Your ticket number is xxx

This mail box is closed

Your ticket number is xxy

This mailbox is closed

After a billing run attempted to send some statements to customers with @clear email addresses.