Error during registration

I have the following problem:
image

What can I do about it?

Thanks

This is because your email provider no longer accepts username/password logins to their server.

Please go to Menu > Accounts and remove the account.

Then click on Add Account and enter the email address in the Automatic Setup.
You will be passed to your web browser to authenticate the account, then back to eM Client where the account will have been setup with oAuth (passwordless).