Articles and tutorials on communication infrastructure.
37–48 of 61 articles
MPP fires your tracking pixel whether or not anyone reads the message. How the proxy works, how badly it skews your metrics, and what to measure instead.
A DKIM signature stays valid no matter who forwards the message. How replay attacks abuse that property to spend your reputation, and the defenses that limit the damage.
Spam traps are addresses that never belonged on your list. The types, who operates them, how they end up in your database, and the hygiene that keeps them out.
Feedback loops send you the complaints your recipients file. How to register with Microsoft, Yahoo, and the rest, and what to build so the data actually gets used.
Hard versus soft is not enough. How SMTP codes, enhanced status codes, and provider quirks should drive your retry, suppression, and reputation logic.
Gmail's filtering models weigh replies, moves, stars, and deletes far more than the open rates senders obsess over. What the signals are and how to influence them.
Gmail enforces a 0.3% user-reported spam ceiling, but the denominator is inboxed mail, and not sent volume. How the rate is computed and how to stay under it.
AMP for Email promised interactive inboxes. Six years after launch, here is who actually supports it, what it costs to run, and when the investment makes sense.
Double opt-in cuts sign-up volume by 20–30%. Here is why the deliverability and list quality trade-off almost always favours confirmation anyway.
Gmail Postmaster Tools and Microsoft SNDS report sender reputation in fundamentally different ways. How to read both dashboards and act on what they actually show.
When email reputation collapses, the first 4 hours determine the recovery timeline. Triage, containment, communication the operational playbook teams actually need.
Bounce-based list cleaning is decades behind modern deliverability. The 90/180/365-day engagement model, sunset policies, and re-engagement that actually works.