ntozierThe thing is, ive logged into this account with the exact same credentials, so the creds arent the problem, it has to be some sort of exchange setting, but I'm not sure what. Nothing online is seeming to do the trick. I've looked at the recieve connectors, verifying end users have access to use all of them, changing them to basic authentication as per some articles online, and even turring off the "Offer basic auth only after starting TLS". Ive verifed the firewall on the server is off (even though it has the default rule 143 for exchange built into it).I've looked at the receive connectors, im at a loss at this point. Hence why i posted on the forum to see if anyone else had this issue.