the relay server fails to connect to the recipient, how to automatically switch to a new relay server

[xdkaka]

Use case

What problem you are trying to solve? Use the relay server to send emails, the relay server fails to connect to the recipient, how to automatically switch to a new relay server, thank you

Your idea for a solution

Configure multiple relay servers, if the relay server fails to send, it will automatically switch to the next one

• [ ] I'm willing to help with the implementation