Where Does Temp Mail Delivery Lag Come From? Wait Two Minutes First, Then Check Four Places

Most temporary email delivery delays don't happen on the receiving end, but from sender-side queuing and rate limiting, greylist retries, silent blocking of disposable domains by platforms, or page polling being suspended. This article gives the order of waiting and troubleshooting, when to stop waiting in vain, and which accounts should never use temp mail from the start and should instead switch to a long-term alias that can be held long-term and forwards as-is.