MIME Parsing Checklist for E-commerce

Create dedicated addresses for orders, shipments, returns, and vendor onboarding to keep parsers focused and reduce cross-contamination of templates.

Require SPF, DKIM, and DMARC alignment for known vendors and marketplaces to block spoofed order confirmations before parsing.

Combine Message-ID with extracted vendor order number to prevent duplicate OrderCreated events when a message is retried or forwarded.

Collect and version control example EML files for each vendor and notification type to guide parser rules and regression tests.

Specify how long to retain raw MIME, which fields to hash or drop, and how to comply with regional privacy rules for customer data.

Decide on a standard currency and UTC normalization so totals and timestamps from diverse vendor emails compare correctly in analytics and invoicing.

Route emails like orders+vendorA@yourdomain to a vendor-specific parser profile and schema mapping to reduce false positives.

Receive email on a subdomain such as inbox.yourdomain to simplify SPF and DMARC and limit blast radius from misconfigurations.

Ensure X-Original-To or Delivered-To is retained so the router can reliably match plus tags or aliases to the correct parsing rule.

Use a distinct Return-Path or VERP to detect delivery failures and out-of-office messages, then bypass parsing and update notification statuses instead.

Protect workers by throttling bulk vendors and rejecting oversized attachments that exceed processing budgets or storage constraints.

Accept only from verified vendor domains and send unknown senders to a manual queue to prevent feed poisoning and parser drift.

Handle multipart/mixed and multipart/alternative with nested boundaries so both the body and attachments are discovered reliably.

Normalize to UTF-8 from charsets like ISO-8859-1 or Windows-1252 to prevent garbled item names, addresses, and currency symbols.

Differentiate inline and attachment parts to avoid extracting table text from PDFs or CSVs as if it were the message body.

Use text/plain for prices and IDs when available, and fall back to HTML table parsing with DOM traversal for heavily styled vendor emails.

Skip CID embedded logos and icons during scraping so SKU detection and totals extraction are not polluted by alt text or filenames.

Cope with soft line breaks in quoted-printable and CRLF inconsistencies that frequently appear in auto-generated marketplace emails.

Accept only expected formats like PDF invoices, CSV manifests, and PNG labels, and strip dangerous paths or control characters from names.

Pull order ID, line items, SKU, quantity, unit price, taxes, shipping, discounts, and currency to power fulfillment and reconciliation.

Recognize multi-line names, apartment numbers, and international postal codes using region-specific patterns and normalization.

Identify carrier names and tracking numbers from shipment notifications to update customer portals and trigger 3PL handoff.

Detect RMA numbers, reason codes, and item counts from return request emails to route approvals and pre-authorize labels.

Convert order and shipment timestamps to UTC while retaining the original offset for audit and SLA calculations.

Extract optional promotional codes and customer notes that affect packing slips and gift wrap logic.

Build targeted CSS selectors or regex templates for each vendor email format, versioned with sample messages for quick updates.

Include a timestamped signature header and rotate keys on a schedule so receivers can verify authenticity and prevent replay.

Use Message-ID and order IDs as idempotency keys and return consistent 2xx responses for repeats to avoid duplicate records.

Configure bounded retries, add jitter to avoid thundering herds, and route exhausted events to a dead-letter queue for review.

Expose a cursor-based polling endpoint for consumers during webhook outages so orders continue to flow.

Transform parser output into OrderCreated, ShipmentUpdated, and ReturnRequested events with clear versioned contracts.

Persist an object storage pointer and hash for audit while keeping bulky MIME out of hot databases to control costs.

Mask email addresses, phone numbers, and full card descriptors in logs and webhooks to meet privacy requirements.

Collect diverse MIME samples including different charsets and languages to validate parsers against real-world variation.

Verify decoding of soft line breaks, long lines, and odd boundary markers common in automated vendor systems.

Inject oversized or unusual headers and encodings to ensure the parser fails closed without resource exhaustion.

Track metrics and segment by sender so regressions in a single vendor template trigger targeted alerts.

Raise incidents when expected fields like order ID or totals are absent, and attach the raw part for rapid triage.

Periodically compare DOM structures from recent emails to baseline snapshots and flag significant shifts before they break extraction.

Document how to requeue messages by Message-ID, backfill events, and coordinate with downstream systems during incidents.