Building an Email Archiving System: The Challenges and of Course the Solution – Part 1. Address common challenges and explore solutions in developing an effective email archiving system for your organization.

Key Takeaways

Email archiving is increasingly essential for regulatory, compliance, and auditing environments.
SparkPost does not store email bodies, but its Archive feature allows senders to receive duplicate messages that mirror tracking links and content.
Email bodies can be stored in Amazon S3, while message event metadata can be stored in MySQL for querying and cross-referencing.
SparkPost message events provide rich activity logs (bounces, deliveries, clicks, opens, unsubscribes, complaints, and more).
Archival copies are only generated when emailing via SMTP.
Message events for original, archive, CC, and BCC emails share a common transmission_id.
Inbound Email Relay can ingest archived messages but does not include the transmission_id, creating a data-linking challenge.
Embedding a hidden unique identifier (UID) in the message body closes that gap and ties inbound content to outbound logs.
Combining archive emails + message events enables building a searchable, auditable archive system.
The long-term project includes code releases for storing archive emails in S3 and logging event data in MySQL.
The final application will allow easy searching, viewing, and reconciling email content with all related event history.
Ideal for compliance-heavy industries that need complete visibility into every message sent.

Why build your own email archiving system?Regulated industries often require long-term storage of both the email body and all associated event logs. SparkPost does not store message bodies, so building a custom system ensures compliance, auditing, and visibility.
How do you obtain an exact copy of the original sent email?SparkPost’s Archive feature sends a duplicate of every outbound email to designated archive addresses, preserving all encoded links and tracking behaviors.
Why can’t you capture the email body before sending?Pre-send capture doesn’t include SparkPost’s modifications (open tracking, click tracking, link encoding). Using Archive copies ensures your saved version exactly matches what recipients receive.
Does SparkPost archive emails automatically?No. SparkPost does not store message bodies. Archive copies must be requested by specifying archive addresses during SMTP injection.
What is stored where in this archiving system? Email body → Amazon S3; Message event logs → MySQL. This separation supports fast search, structured queries, and inexpensive object storage.
How long does SparkPost retain event data?SparkPost stores message events for 10 days. After that, the data must be ingested via webhook or queried and stored elsewhere.