Email Deliverability: Bounce Rates, Complaints, Inbox Placement & List Hygiene

What you'll build

What you will be able to do

Each lab ends with a concrete result that you build yourself and the checker confirms, cell by cell.

• Measure what Pinecrest Outfitters actually delivered per campaign, split hard and soft bounces and spot the send that went to a bad list.
• Calculate the complaint rate per mailbox provider, see how the overall rate hides a problem, and flag the providers above the thresholds.
• Turn a seed test into inbox and spam rates per provider, then weight them by your own list to estimate how many emails reach the inbox.
• Find each subscriber's most recent engagement, put them into recency segments with a lookup, count the segments and mark who should not get every campaign.
• Roll the list forward month by month, with hard bounces, unsubscribes and sunset removals, and see how much new opt-ins must replace.
• Turn text flags from a DNS and header check into a score per sending domain and a Ready / Fix first status.
• Plan a 14-day warm-up: a daily volume that grows by a fixed factor, rounded and capped at the target, with dates, cumulative volume and the day the target is reached.
• Run the email funnel from sent to revenue for today's deliverability and an improved one, and judge whether the clean-up pays for itself.