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CephalonEngine

Cephalon.MultiTenancy.Governance.AmazonSesDelivery

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Maturity: M2 · Ownership: cephalon-managed · Family: multi-tenancy · See audit, matrix.

Cephalon.MultiTenancy.Governance.AmazonSesDelivery is the optional Amazon SES v2 sender companion for tenant-invitation delivery.

What it owns

Section titled “What it owns”
  • one provider-managed ITenantInvitationDeliverySender implementation for Amazon SES v2 SendEmail handoff
  • configuration-driven setup through Engine:MultiTenancy:Governance:AmazonSesInvitationDelivery
  • code-first setup through AddCephalonAmazonSesInvitationDelivery(...)
  • a replaceable IAmazonSesInvitationDeliveryClient seam so hosts can test, wrap, or replace the default AWS SDK client
  • default IAmazonSimpleEmailServiceV2 registration using the AWS SDK region/credential resolution chain, with optional RegionSystemName
  • recipient email resolution from dispatch metadata, invitation metadata, or InviteeKind = email
  • plain-text and optional HTML message templates with bounded Cephalon placeholders
  • Amazon SES simple message payload construction for sender, recipient, subject, text body, optional HTML body, reply-to addresses, configuration set, and message tags
  • deterministic Cephalon message ids carried through safe Amazon SES message tags
  • safe sender metadata such as region, configuration set, SES status code, SES message id, request id, Cephalon message id, sender id, recipient email, body content type, reply-to count, tag count, and client outcome reason
  • safe Cephalon context tags that Cephalon.MultiTenancy.Governance.AmazonSesDelivery.AspNetCore can later translate from SNS-wrapped SES event publishing payloads
  • stable diagnostics for accepted and failed Amazon SES invitation dispatch attempts

Main surfaces

Section titled “Main surfaces”
  • Configuration/AmazonSesInvitationDeliveryOptions.cs
  • Hosting/AmazonSesInvitationDeliveryServiceCollectionExtensions.cs
  • Services/IAmazonSesInvitationDeliveryClient.cs
  • Services/AmazonSesInvitationDeliveryClientResult.cs
  • Services/AmazonSesInvitationDeliveryMessage.cs
  • Services/AmazonSesInvitationDeliverySender.cs
  • Services/AmazonSesInvitationDeliveryDiagnosticsConventionContributor.cs

Source structure

Section titled “Source structure”
  • Configuration
  • Hosting
  • Services

How it fits

Section titled “How it fits”

The core Cephalon.MultiTenancy.Governance package owns the host-agnostic invitation delivery dispatcher, run catalog, outcome recording, retry queue, and ITenantInvitationDeliverySender extension point. This companion package supplies a real Amazon SES v2 sender for teams that want Cephalon to hand a prepared invitation email to SES without writing a custom sender first.

Register the governance pack, then register the Amazon SES sender:

builder.Services.AddCephalonAmazonSesInvitationDelivery(builder.Configuration);


builder.AddCephalon(engine =>
{
    engine.AddMultiTenancyGovernance();
});

Configuration example:

{
  "Engine": {
    "MultiTenancy": {
      "Governance": {
        "AmazonSesInvitationDelivery": {
          "Enabled": true,
          "SenderId": "amazon-ses-email",
          "RegionSystemName": "us-east-1",
          "ConfigurationSetName": "cephalon-invitations",
          "FromEmail": "noreply@example.com",
          "FromName": "Example SaaS",
          "ReplyToAddresses": ["support@example.com"],
          "RecipientEmailMetadataKey": "email",
          "SupportedChannels": ["email"],
          "SubjectTemplate": "Invitation for {tenantId}",
          "TextBodyTemplate": "You have been invited to tenant {tenantId}. Invitation: {invitationId}. Roles: {roles}.",
          "HtmlBodyTemplate": "<p>You have been invited to tenant <strong>{tenantId}</strong>.</p>",
          "Tags": {
            "product": "example-saas"
          },
          "IncludeContextTags": true,
          "AcceptedStatusCodes": [200]
        }
      }
    }
  }
}

When RegionSystemName is omitted, the AWS SDK default region resolution chain remains authoritative. Credentials are owned by the host and the AWS SDK credential chain; Cephalon does not record AWS credentials or message bodies in metadata.

The sender returns dispatched only when the AWS SDK reports that SES accepted the SendEmail request and returned a real SES message id. Unsupported channels are reported as suppressed; invalid recipient resolution, AWS service errors, non-accepted status codes, and timeouts are reported as sender-failed. The governance dispatcher persists those outcomes through the invitation store, queues retryable sender failures when the retry queue is enabled, and keeps externalDeliveryOwnership = provider-managed when this sender handled the attempt.

This package intentionally owns Amazon SES v2 SendEmail handoff only. SNS-wrapped SES delivery-status callback translation, SNS signature verification, process-local SNS replay protection, observation-store-backed SNS message-id idempotency, opt-in verified SNS subscription confirmation, and opt-in verified SNS unsubscribe-confirmation observation live in Cephalon.MultiTenancy.Governance.AmazonSesDelivery.AspNetCore. AWS account setup, identity/domain verification, IAM policy, DKIM/SPF/DMARC posture, SES sandbox movement, SES configuration-set event destination setup, SNS topic/subscription creation, automatic resubscribe/restore, subscription lifecycle governance, provider polling, durable callback inboxes, public onboarding, tenant-admin UI/backoffice, identity-provider sync, SMS, chat, and CRM delivery remain host-owned or future companion work until a package owns those paths explicitly. SendGrid Mail Send handoff lives in Cephalon.MultiTenancy.Governance.SendGridDelivery; Mailgun Messages API handoff lives in Cephalon.MultiTenancy.Governance.MailgunDelivery; Microsoft Graph sendMail handoff lives in Cephalon.MultiTenancy.Governance.MicrosoftGraphDelivery; SMTP relay handoff lives in Cephalon.MultiTenancy.Governance.SmtpDelivery.

Section titled “Related docs”