I got the following error this morning on email sent from Google servers to xtra. Is there a problem with the xtra/yahoo mail system?
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain xtra.co.nz by mx1.tnz.mail.yahoo.com. [18.104.22.168].
The error that the other server returned was:
501 Syntax error in parameters or arguments