NI: Received an NDR for one of our Domains - 550 Host unknown (B158292)

Issue

We are getting NDR for our "domain.com" domain e-Mail address accounts from Exchange (see below). From what we are seeing, accounts with 'domain.com' e-Mail addresses are assigned with a target forwarding address of 'domino.domain.com' within AD. We believe that the domain name is missing in our Co-Existence Domino mail server and need assistance configuring it.

----- The following addresses had permanent fatal errors -----
(reason: 550 Host unknown)
----- Transcript of session follows -----
550 5.1.2 ... Host unknown (Name server: http://domino.domain.com.: host not found)

Solution

The solution is to update notes.ini file on your coex. server(s).Edit the document and find the following parameter: BTPROCESSDOMAIN

BTPROCESSDOMAIN=domain.com,domino.domain.com

 Review your environment, and make sure all Domino domains are listed within the BTPROCESSDOMAIN parameter.

Note: There is a 216 character limit. A second BTPROCESSDOMAIN= may be added for the additional domains, so it would look like this:

BTPROCESSDOMAIN1=domain.com,domino.domain.com
BTPROCESSDOMAIN2= additionaldomain.com

BTPROCESSDOMAIN, without a trailing number, can be used for a single line of domains.
· Only 15 domains are supported using this method
· Each line in the NOTES.INI file is limited to 216 characters.
· Multiple BTPROCESSDOMAINx lines can be defined (i.e. BTPROCESSDOMAIN1=… BTPROCESSDOMAIN2=…):
· If more than 15 domains are required or;
· If all 15 domains cannot fit on a single 216 character line.
· The trailing numbers must be sequential.
· Each line, except for the last, must end in a comma.
· The * character can be used to start a domain (example: *.contoso.com)