This extension will resolve all issue of OpenCart 3x emailn you can use gmail or any another emails for your opencart website. 1 Install this extension via admin installer then go to the modification & refresh. 2 Now go to the extensions/modules 3 Install Email & SMTP 4 after install, edit Email & SMTP then enable it & save 5 now go to the modification & refresh 6 now see under NAVIGATION tab click on EMAIL & SMTP then activate license. 7 now configure all required settings 8 done.