[Internal]: document Elastic Cloud Serverless email service limits

[thbkrkr]

This task consists in documenting the Elastic Cloud Serverless email service limits which are exactly identical to the Elastic Cloud Hosted email service limits.

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Cloud email service limits

The following quotas apply when using the Elastic email service:

• Email sending quota: 500 emails per 15min period
• Maximum number of recipients per message: 30 recipients per email (To, CC and BCC all count as recipients).
• Maximum message size (including attachments): 10 MB per message (after base64 encoding).
• The email-sender can’t be customized (Any custom From: header will be removed)

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[eedugon]

IMO we should address in the following way:

• Document the serverless email service limit somewhere in the deploy > Elastic Cloud doc set.

• Move the details of the ECH service limit from the current location (Watcher related doc) to a proper place (probably together with the Serverless information), and just make a note in the watcher doc about the email limits linking to the information.

[thbkrkr]

Sounds good to me!