First you should verify that your DPM server is allowed to relay on your SMTP server.
If you are using Microsoft IIS, you will find this security settings in IIS MMC by right-clicking SMTP virtual Server then Properties. Select Access tab / Relay restriction / Relay. Check box Only the list below , then click Add and provide IP, Subnet or Domain Name.
In the DPM Administrator Console go to the Monitoring tab / Options / SMTP Server and fill in SMTP settings according to your environment:
- SMTP server name: YourSMTPServer
- SMTP Server Port: 25
- From Address: Address of the sender
Important: You must also fill in Authenticated SMTP server fields.
Why ? Because DPM requires ALL the fields under the SMTP Server options to be filled in regardless if your SMTP server accepts anonymous connections or not. if your SMTP server does not require authentication the credentials are useless, it's just that GUI is expecting all fields to be filled in.
The GUI could have been more precise or at least a mouse over option might help. Technet article is also a little bit unclear... http://technet.microsoft.com/en-us/library/hh758196.aspx :)
If you click on Send Test E-mail without filling in Username or Password, you will receive the following error: ID: 2013 Details: Logon Failure: unknown user name or bad password.
DPM will ask you to provide the e-mail address to sent the test message:
Then after clicking on Send button.
You will receive a new message: An E-mail message has been successfully sent to ...
Good job, finally open your mailbox and verify that you receive the test message.