E-mail Retry Mechanism

## What?

At times, temporary infrastructure-level communication issues may occur between services. Especially in managed service environments, the actions users can take in response to such situations are limited.

Of course, the root cause of these issues is not Graylog itself.

However, it appears that when Graylog attempts to send an email, it only tries once and then immediately displays a failure notification banner if the attempt is unsuccessful.

In such cases, it would be more useful if the system attempted to resend the email multiple times before displaying an error notification.

Thank you.

## Why?

Although they do not occur frequently, transient outages are a reality of modern systems. As mentioned, in managed service environments users are often limited in the actions they can take. Allowing the software to automatically retry could help mitigate these kinds of temporary hiccups and make them effectively negligible.

## Your Environment

* Graylog Version:
* OpenSearch Version:
* MongoDB Version:
* Operating System:
* Browser version: