I got the following error while sending email using asp.net c#. You should check the authentication correctly configured or not in Network Credential. If then it is proper it should be blocked by the yahoo server.
Solution:
You need to login into your account,
Go to Account info-> Account Security->
Turn on “Allow apps that use less secure sing in”
OR
Click here: https://login.yahoo.com/account/security#other-apps
Turn on “Allow apps that use less secure sing in”
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