This usually means you have given incorrect credentials to the email server. Check what you have configured in the mail server settings. With exchange, a common error is to only provide a user name, or an email address - you need to give it the full domain credentials including the domain.
1、The credential is right(because confirmed in OWA), usually I use mail address, and even try AD\User format;
2、The reason is Exchange 2016 default SMTP in port 25, named as "Default Frontend MAIL", in security setting does not include "Exchange users", check it will works;
3、Another way is create a new "receive connector" in port 587 for kind of these uses.
Hello Insight users, As part of our (Mindville's) acquisition by Atlassian, our training team is looking to build some new Insight training materials. It would really helpful if you can ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events