Delivery Status Notification (Failure) Apple Mail

Hi Everyone

Like a lot of Australians we have been short shrifted with TPG/iinet and their other ISPs to move all our email accounts to the Messaging Company at a cost, I had 6 addresses, now all moved to 2 Gmail addresses I always had.

All emails were accounts in Apple Mail, simple no dramas, only now, I removed all the older iinet accounts.

I keep getting these dreaded Delivery Status Notification (Failure) 550 5.1.1 (old deleted email address) recipient rejected.

These email notifications are going to Junk, and they are actually being delivered to the right Gmail box.

If anyone is getting this same hassle and has an idea of basically stopping these at the source, let me know, or if anyone wants to look at the headers I am happy to provide that as well.

many thanks

Bryan