I’ve got 2 servers in a cluster handling SMTP email (mx1 and mx2) and 2 internal notes servers (in another cluster).The internal servers route their email over the MX1 server, as there is no official way to route smtp to 2 servers.
So question 1:
Can I have the internal cluster use both external servers (loadbalanced or something)
Question 2:
How can I have the email failover to the second server if the mx1 server’s internet connection is down, but the server is still (internally) up.
Subject: smtp email redundant solution
In answer to question 1, setting up a DNS round robin would work for load balancing. From my understanding of of how it works it rotates IP addresses that you allocate. So once one server IP address is handed out it moves to the back of this list and then the next server IP is handed out balancing the load between the number of IP addresses in the list.
Hope this helps.
Subject: smtp email redundant solution
Put your two mx server names separated by a comma in the Relay Host field of your Domino config document:
Domino will round-robin outgoing mail across both hosts, and if one fails it’ll send to the other. I don’t think it’s documented anywhere, but that has worked since Domino 5.x at least.