550 5.1.1 resolver. ADR. exrecipnotfound; not found

If the code on the title appears, the Bounce Message content is generally:Check the recipient's email address and try again. If the problem persists, contact the support staff.
This problem is caused by the old address cache. When you open the Outlook client, create an email, and manually enter the email address in the address bar, you cannot send the email

Press the delete key to delete the email address. Close the Outlook client and re-open the test.

This article from the "melon grass" blog, please be sure to keep this source http://wangw512.blog.51cto.com/897383/1547321

550 5.1.1 resolver. ADR. exrecipnotfound; not found