In-depth technical articles from the systems engineering team at Koracle LLC. Each guide covers a specific layer of modern email infrastructure: DNS authentication (SPF, DKIM, DMARC), RFC 5322 MIME parsing in serverless environments, browser XSS sandboxing, and email compartmentalization.
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Migrating ephemeral TTL state from eventually consistent KV caches to serverless SQLite
Why we moved ephemeral inbox state from distributed KV caching to strongly consistent serverless SQLite: eliminating 3-second polling negative-cache lag, rejecting unallocated inboxes at the SMTP boundary, and reaping expired leases asynchronously.
Preventing XSS when rendering untrusted HTML emails in a browser
Defense-in-depth security architecture for webmail and disposable inbox UIs: HTML sanitization pitfalls, CSS and SVG attack vectors, and zero-privilege sandboxed iframe isolation.
How RFC 5322 MIME parsing works in serverless edge environments
Inside RFC 5322 and multipart MIME parsing in stateless edge isolates: handling ReadableStream payloads, transfer-encoding edge cases, charset normalization, and strict memory limits.
How to test SPF, DKIM, and DMARC records in staging environments
A practical systems-engineering guide to isolating staging DNS zones, avoiding the 10-lookup SPF limit, rotating DKIM selectors, and verifying DMARC alignment against a live disposable receiver.
Disposable email architectures in 2026: retention models compared
An architectural comparison of major temporary inbox services in 2026: retention timers, public vs. isolated inboxes, HTML sandboxing, and infrastructure trade-offs.
Email vs. SMS verification: how modern signup flows work
How websites choose between email one-time codes, magic links, and SMS verification, why regulated platforms require phone numbers, and how to pick the right privacy approach.
Email privacy on social platforms: why aliasing beats disposable mail
Why identity-sensitive social platforms require persistent verification, what email compartmentalisation protects against in data breaches, and why forwarding aliases are the right tool.
How tenmin.app works under the hood: ephemeral edge email architecture
An end-to-end walkthrough of the architecture: edge SMTP ingress, isolated MIME ingestion, serverless SQLite storage with a 600-second lease TTL, and zero-privilege HTML sandboxing.
How to sign up for newsletters without drowning in marketing follow-ups
A practical walk-through of using disposable addresses, plus-addressing, and aliasing to receive the content you signed up for and skip the marketing drip.
Email privacy 101: what your address reveals about you
Headers, tracking pixels, fingerprinting, list brokers, and the technical mechanisms that determine how much your email leaks across the internet.
A developer's guide to testing transactional email with a disposable inbox
Using a throwaway address to QA password resets, magic links, signup flows, and template rendering without polluting your personal mailbox or a shared QA account.
Why some sites block disposable email and how domain validation works
Understanding the domain reputation lists, MX lookups, validation libraries, and risk signals that lead sites to reject temporary addresses, plus when to use a persistent alias.
Disposable email vs. email aliasing: choosing the right architecture
A side-by-side comparison of throwaway inboxes, forwarding aliases, plus-addressing, and full custom domains, with a decision tree for picking the right tool.
Editorial authorship & independence
These guides are written, reviewed, and maintained by the systems architecture team at Koracle LLC. Every article is grounded in production operational experience running inbound email infrastructure at the network edge.
Where a guide references third-party tools (such as SimpleLogin, Addy.io, or Apple Hide My Email), we have no commercial affiliation and receive no referral commissions.