Problem Sending Mail Without Smtp Auth on OpenSearch - Critical

[pablo]

@espala How many nodes do you have in the cluster?

I want to expand @AESthetix256 question

About Mail Sending Problem on Alerting Notification Section

Hello @espala How exactly did you configure your connection to the smtp server - the log you provided shows that you want to connect to smtp.domain.com. Did you configure your hosts file / dns server to redirect this domain to your email host? Otherwise it might tries to connect to the wrong server. BR, Andreas

Can you resolve the DNS name and connect to smtp.domain.com:25 from all of the nodes in the cluster?