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When you try to send a test message (assuming that the password is correct), you can get an error message "This User Does Not Have Access Rights To This Service".

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In order to solve it, you need to do the following:

1. Open the profile page in Yandex.Pasport. Scroll down to Passwords and authorization → Enable app passwords.
   

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2. In the window that opens, select "Create a new password"
   

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3. Select the type of application “Mail“

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4. Enter an arbitrary name for a password and click the "Create" button.

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5. In the window that opens, click the "Copy" button (1) and the "Done" button (2)

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6. Insert the copied password in the ZennoPoster mail service properties

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7. The next step is to go to the mail settings page. Mail → All settings → Email clients https://mail.yandex.com/#setup/client
   

8. Allow access to the mailbox from third-party mail clients and save the changes.
   

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9. After that, repeat the test message sending. If everything is done correctly, then in the status bar you will see "Test email has been sent successfully".