If you want to use the same name space you will need a transition Domino domain. So you'll need to build another Domino server.  I do the same thing when customers migrate off Domino for email.  This is by no means a complete to do list...

Create a new Domino server in a new domain called NEWMAIL and configure directory assistance with your existing Domino directory.

Create a global domain doc in the new domain and copy the details from your existing Domino domain.

Create a config doc and set the field Local Internet domain smart host to the SMTP relay of your new mail service.

Then person docs for new mail service users will be:

Mail system = Other Internet Mail

Domain = NEWMAIL

Forwarding address = fred.blogs@acme.co.uk

Internet address = fred.blogs@acme.co.uk

This is of course assuming that your MX is pointing to Domino and your SMTP relay for the new service won't simply route to your MX.

Thanks for the reply and the detailed description - much appreciated Porter!

I just learned that the mail client they are using are IBM Verse in the Cloud, do you by any chance now if in my scenario would be possible to configure the Domino server to send mails to?

I will keep in mind the fact that we might need to create a new Domino server.

 

Are you using a Verse hybrid config?  If you are then you won't need a second Domino server and you can just extend your existing Domino environment by synchronizing the directory with the Verse tenant. But if it's currently working then I would've thought it was already setup.

https://www.ibm.com/support/knowledgecenter/SSPS94/hybrid/topics/cfg_hy_configure_hybrid_t.html

https://www.ibm.com/support/knowledgecenter/en/SSPS94/hybrid/topics/pln_hy_customeradmin_experience_c.html

We found the solution to the problem.

Simply by changing the FQHN on the Domino server from development.acme.co.uk to development.test.acme.co.uk it worked.

It seems like the Domino server uses the FQHN name to somehow route mails, so by making that different it started sending mails out.

Thanks for the help Porter.