The configMap data must have entries in a key: value form to configure the mail server, as shown below for smtp field:

emailServerConfigmap
apiVersion: v1
kind: ConfigMap
metadata:
name: configmail
namespace: <netbackup-namespace>
data:
  smtp: "xyz.abc.domain.com"
  smtp-use-starttls: ""

If there is a specific parameter that needs to be set only (not value), a key can only be specified with the smtp-use-starttls field.

Exec into the primary container using the following command:

kubectl exec -it -n <namespace> <primaryServer-pod-name> -- bash

Update the persistent file at /mnt/nbdata/usr/openv/etc/mail.rc to set the fields as required.

Exec into the primary container using the following command:

kubectl exec -it -n <namespace> <primaryServer-pod-name> -- bash

Execute the following commands in the primary container:

mv /etc/mail.rc /mnt/nbdata/usr/openv/etc/mail.rc

ln -nsf /mnt/nbdata/usr/openv/etc/mail.rc /etc/mail.rc

Update values for required fields at /mnt/nbdata/usr/openv/etc/mail.rc. An example of mail.rc file is shown below:

mail.rc
# mail server configuration
set mail
set mailserver=xyz.abc.domain.com:25
set smtp-use-starttls