Article ID: KWin0097
Added: 9/22/09 BC
Updated: 11/05/09 AF/SS
Since RDP products don't pass authentication to an SMTP mail server,
a local SMTP server is used. If a customer needs
authentication, there is an option. However, this option makes e-mails
sent by RDPWin prey
to the rules of the authenticated e-mail server where the mail is relayed.
This process may resolve problems with spam, since the relaying of the mail will
be through a legitimate mail server for the customer’s domain.
Steps for Authentication to Another SMTP Server
- Log into the computer that is running the SMTP server used by RDPWin.
- Go to IIS -> Default SMTP Virtual Server -> Right click and go to
- Select the Delivery tab and Click the Advanced... button.
- In the smart host field enter the qualified name of the authenticating
SMTP server that is offsite (i.e. mail.YourDomain.com). If an IP
address is to be used, the entry within this field must in the format:
[xxx.xxx.xxx.xxx] (Notice the use of brackets around the IP address).
- Once an entry has been placed within the smart host field,
the option of ‘Attempt direct delivery before sending to smart host’ becomes
available. DO NOT CHECK THIS. All mail should go
to the authenticating SMTP server. Click OK to return to the Delivery tab.
- Click the Outbound Security button to access the Outbound Security
screen. **See notes on Outbound Security.
This step may not be necessary.
- Select the type of authentication needed. Most customers use Basic
- Enter the user name and password required to authenticate on the outside
authenticating SMTP server and click OK to save.
- Click Apply and OK to save the settings on the Delivery tab.
Try a test e-mail from RDPWin. RDPWin should send the mail to the
internal SMTP server and reply with a successful delivery message.
Some external SMTP servers used by
customers may limit their use by static IP. There may be no user name and
password. RDP recommends not using the IP or name of this external SMTP mail
server directly within RDPWin because in some cases delivery response is
Outbound Security: To avoid
issues with RDPWin timing out while waiting for delivery, it is recommended
that RDPWin is directed to an internal SMTP server that relays the
mail to the external server without any ‘Outbound Security’. The ‘Outbound Security’
steps could be skipped in this instance.