As the error clearly states, this indicates DNS issues. Check your resolvers, alternatively make sure that the receiving domain is properly set up. If the problem is at their end it’s not much you can do about it until they fix it.
As the error clearly states, this indicates DNS issues. Check your resolvers, alternatively make sure that the receiving domain is properly set up. If the problem is at their end it’s not much you can do about it until they fix it.