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In this scenario, confirm that the destination server is reachable or engaged your Disaster Recovery service.

This will allow email transfers from POPcon to Exchange without prior authentication again.This is not simply annoying; it is dangerous as well for your deliverability.In fact, it implicitly suggests to ISPs and reciving systems that you don't really care about your list hygiene - just like spammers: so with time you could be penalized and see your delivery rate decrease.But since POPcon simulates incoming email from remote servers it can not authenticate itself to Exchange.You can change the authentication settings with the Exchange Management Console: To find receive connectors in the Exchange Management Console, navigate to Server Configuration - Hub Transport.