default host name for keychain item is always deliver.

[Manfred Endres]

The comment in PasswordManager says:
HOST = "deliver" # there might be a string appended, if user has multiple accounts

But since the username is always appended regardless if its empty:

def hostname
    [HOST, self.username].join('.')
end

We end up with a HOST value deliver. instead of deliver

[Felix Krause]

Thanks for letting me know, I updated the comment

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