Setup email notification channel

Versions (relevant - OpenSearch): 2.6.0

Describe the issue:
To configure email notifications channel, I need to specify a list of allowed IP addresses on the smtp server side. Should I include all cluster nodes in this list, or may it be only nodes with specific roles (master, data…)?

Hey @TCR

Short answer, Master node which should be the node with Opensearch-Dashboard attached to it.

Thanks, this makes things a bit easier.

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