Got "debug smtp: auth ntlm failed" with Exhchange Server

[SYREA]

Crowd connect to Exchange Server failed as above. 

How to solve this.

[Nic Brough -Adaptavist- · Accepted solution]

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.

[SYREA]

Thanks, Nic.

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.

Thanks, again.

[Nic Brough -Adaptavist-]

So you had configured Exchange to reject the login as invalid?  And now fixed that?

[SYREA]

1、That's Exchange 2016 default settings;

2、Problem solved now.

Thanks.