I’m trying to figure out an SMTP routing issue and hoping that someone here can help.
We have 2 Domino server at 2 different geographic locations (Server A & Server B). The 2 servers are in a cluster. Each server has the SMTP Mail Routing task enabled, is set to use SMTP when sending messages outside of the local internet domain, the 2 servers are NOT in the same Notes Named Network, and we have connection docs setup between the 2 servers.
Using this setup each server is able to send out SMTP messages directly to the Internet which is what we want. All incoming SMTP messages are delivered to Server A then the mail is routed internally accordingly which is also what we want.
This has all been working fine. However, a few days ago Server B lost its connection to the Internet due to an issue at our ISP. When this happened all SMTP traffic being sent from Server B started backing up in mail.box. I thought that since Server B had a connection doc to Server A it would automatically route mail out thru Server A if it was unable to send it out itself but this didn’t happen.
To get it working we had to change the Notes Named Network value on Server B to match Server A, disable the SMTP Mail Routing task on Server B, and change the “SMTP used when sending messages outside of the local internet domain” option in the Server B Configuration Document to Disabled. After making those changes and restarting the server it immediately started transferring all the messages in the Server B mail.box to Server A and they were sent out from there.
My question is how do I setup the 2 servers so that they can send out SMTP traffic directly to the Internet but if one server loses its Internet connection it will automatically start sending out via the other server. Is this even possible?
Any help would be greatly appreciated.