Deprecating Legacy Email Infrastructure: Migrating Away from jada@ and Hardening SES Configuration

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This post documents a critical infrastructure remediation session where we identified and began decommissioning a legacy email sender identity that was generating excessive SES compliance warnings, while simultaneously hardening our email authentication and monitoring posture.

The Problem: Legacy jada@ Identity Generating SES Complaints

During routine operations, we discovered that our Amazon SES account was generating recurring "nastigrams" (compliance warnings) tied to the jada@queenofsandiego.com sender identity. Investigation revealed this was a legacy sender account with unclear ownership and usage patterns, being referenced in multiple places across our infrastructure:

Active LaunchAgent plist file triggering automated email jobs
Legacy Python blast scripts (jada_blast.py) still configured in the codebase
Unclear sender domain reputation and DMARC authentication posture
Excessive forensic report generation from DMARC configuration

The core issue: we had no clear operational owner for this sender identity, making it impossible to defend compliance or adjust send patterns responsibly.

Technical Investigation and Findings

SES Account State Review

First, we audited the complete SES configuration for queenofsandiego.com:


# Commands executed to assess SES health:
- Check SES account status and overall sending health metrics
- List all SES-verified identities across the account
- Inspect SES configuration sets and DMARC forensic report settings

This revealed that:

Multiple verified identities were active, including the problematic jada@queenofsandiego.com
DMARC policy was configured with forensic reporting enabled (fo=1 flag)
The forensic report email address was being set to jada@, creating a feedback loop of abuse reports
No explicit Domain-based Message Authentication, Reporting & Conformance (DMARC) alignment was enforced

DNS and Email Authentication Audit

We conducted a comprehensive Route53 and DNS record audit:


# Hosted zone for queenofsandiego.com located in Route53
# Records inspected:
- MX records (mail exchange priorities)
- TXT records (SPF, DKIM, DMARC policies)
- CNAME records (SES verification)
- All zone configuration for domain reputation assessment

Key findings:

SPF record was present but not explicitly scoped to SES sending domains
DMARC TXT record contained fo=1 (forensic report flag) and ruf= (reporting URI) pointing to jada@
DKIM configuration was properly established via SES-generated CNAME records

Legacy Script Inventory

Filesystem audit identified multiple blast script implementations:

/Users/cb/Documents/repos/sites/queenofsandiego.com/tools/send_blast.py — Primary blast sender
/Users/cb/Documents/repos/sites/queenofsandiego.com/tools/run_scheduled_blast.py — Scheduled task runner
jada_blast.py — Legacy implementation (origin and current use unclear)
LaunchAgent plist configuration still actively invoking legacy script

The legacy jada_blast.py was actively registered in the macOS LaunchAgent system, meaning it could execute unsupervised at scheduled intervals.

Remediation Actions Executed

1. DMARC Policy Hardening

We removed the forensic reporting configuration from our DMARC TXT record in Route53:


# Original DMARC policy (simplified):
v=DMARC1; p=quarantine; ruf=mailto:jada@queenofsandiego.com; fo=1; ...

# Updated policy:
v=DMARC1; p=quarantine; ... (ruf and fo=1 removed)

Why this matters: The fo=1 flag triggers forensic reports for ANY policy failure, and ruf= directs them to the jada@ address. This created a compliance feedback loop: ISPs reporting policy failures → emails to jada@ → potential delivery issues → more compliance reports. Removing these reduces noise and improves email deliverability signals.

2. SES Verified Identity Audit

We documented all currently verified identities and their usage patterns. The jada@queenofsandiego.com identity was flagged for deprecation and removal once all active campaigns using it are migrated or completed.

3. Blast Script Modernization

Updated the primary blast system configuration files:

/Users/cb/Documents/repos/sites/queenofsandiego.com/tools/send_blast.py — Verified sender identity configuration
/Users/cb/Documents/repos/sites/queenofsandiego.com/tools/run_scheduled_blast.py — Updated to use modern sender identities
/Users/cb/Documents/repos/sites/queenofsandiego.com/tools/maintenance/staging-index.html — Deployment and maintenance tracking

Key code pattern update:


# Old pattern (to be deprecated):
sender_email = "jada@queenofsandiego.com"

# New pattern (prospective):
sender_email = config.get_verified_sender_identity()  # Returns current approved sender

4. Operational Metadata and Documentation

Updated the maintenance hub with notes documenting:

New access codes for first mate / Travis scope (replacing legacy jada@ references)
Migration timeline for legacy campaigns still using jada@ sender
Approval chain for any remaining jada@-based sends during transition period

Deployed updated staging configuration to /tools/maintenance/staging-index.html for team visibility.

Architecture Decisions and Rationale

Why Remove Forensic Reporting Entirely?

DMARC forensic reports are valuable for security investigations, but only when:

You have dedicated staff to review them
They route to a monitored inbox with clear escalation procedures
Your sending infrastructure is sufficiently mature that failures are exceptions, not the norm

Routing them to an unmaintained legacy address creates noise and potential delivery issues. When reintroduced, they should go to an active operations address with documented SLAs.

Centralized Sender Identity Management

Rather than hardcoding sender addresses across multiple scripts, we're moving toward a configuration-driven approach where sender identity is managed centrally. This enables:

Fast identity rotation during compliance issues
A/B testing different sender reputations for open rates
Audit logging of which campaigns used which identity