The client email cannot be sent, prompting the server to return

I used126The client is Microsoft Outlook. A problem occurred recently. The server rejects the sender's email address because the email fails to be sent,Tip: the server returns. UseFoxmailThe same is true (see). What should I do?

If a problem occurs, you must go to the Internet to find the cause and solve the problem in a few minutes. Now let's share the solution:

(Foxmail client) tool --- account --- properties -- server -- sending mail server, select" my server requires authentication. The default setting is "use the same settings as the receiving email server ".