Problem sending ermail

i am seeing error 500 when trying to send email
Nodejs - docker - wappler 3.7.7 - Digital ocean hosting

i see following errors -

1. {status: “500”, code: “ENOENT”, message: “spawn sendmail ENOENT”,…}

2. code: “ENOENT”

3. message: “spawn sendmail ENOENT”

4. stack: “Error: spawn sendmail ENOENT↵ at Process.ChildProcess._handle.onexit (internal/child_process.js:268:19)↵ at onErrorNT (internal/child_process.js:470:16)↵ at processTicksAndRejections (internal/process/task_queues.js:84:21)”

5. status: “500”

here is my setup

Mailer issue 1877×605 20.8 KB

Mailer issue 2893×552 25 KB

image1278×581 54.6 KB