Hi!
Our Exchange 2013 Server trying to send messages to a domain but in the queue viewer it says "Last Error: 454 4.7.1 Relay Access Denied". We are not trying to relay anything through their email system. We are just replying to their emails but stays in our exchange queue. We used our ISP E-Mail Server as a smarthost and it worked but now it is also not working. We are using DNS Resolution in our Exchange with send connector.
Any Suggestions?