INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.1.1

INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.1.1

Hi,
My admin did a change in the setting last night and all emails I'm sending now to China are bouncing back with notification:

This message was created automatically by mail delivery software.

 A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

 

sales@hugebattery.com INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.1.1 The email account that you tried to reach does not exist. Please try

                                                5.1.1 double-checking the recipient's email address for typos or

                                                5.1.1 unnecessary spaces. Learn more at

                                                5.1.1  https://support.google.com/mail/?p=NoSuchUser f13si4051863plm.259 - gsmtp

 

 My admin said: 
I've only changed email routing preferences to duplicate send/receive abilities for addresses that are also under our GSuite (gmail) account. So what happens is, the addresses which are duplicated under gmail also receive incoming / outgoing mail in addition to Zoho. It does not have an actual effect on Any Zoho account