Authentication details provided was rejected by Source server. Kindly provide valid username and password.

Authentication details provided was rejected by Source server. Kindly provide valid username and password.

Hello,

I am trying to migrate mails from old server to zoho email hosting.
I have added all details correctly, including email id and its password.
also tried with none and SSl setting, but still unable to connect.

Authentication details provided was rejected by Source server. Kindly provide valid username and password.

Please guide me ASAP.