Hey

Thank you for your response what should I do in this case as I checked all the settings are correct

I mean no offense, but people regularly post here that their settings are correct, only to discover that they were not. If you're confident that they are correct, I suggest you contact your email provider on the other possibilities shown in the message.

Again, I mean no offense, but if you think there may be an error, you will get possible feedback by posting the settings you are using, not necessarily be me as I have special expertise in this, but there are others here who may.