I am not having much success with removing a Previous Recipient in Mail 4.4
Although I went to Window/Previous Recipients, and deleted an address, it continues to show up in the suggested addresses when I create a new email. After deletion it is no longer in the Window/Previous Recipients list, and I have even done a restart....but it keeps appearing.
iMac (Retina 5K, 27", 2017), 3.4 GHz Intel Core i5, 8GB RAM, 2400 MHz DDR4
OS Mojave 10.14.6
Canon MX710 Printer
Epson Perfection V500 Photo Scanner
Time Machine on 1TB LaCie USB-C
Carbon Copy Clone on 500GB OWC Mercury OTG Pro