How it works
Validation tells you the address exists. We tell you whether sending to it will hurt your reputation.
Here is what happens between the upload and the report.
Yanna-Torry Aspraki
Litmus Coach 2020·Ask a Deliverability Expert·8,000+ lists reviewed·Lenovo Twinning Finalist
A validation tool
m.harrington@northstar-supply.co
Review My Emails
m.harrington@northstar-supply.co
Opened twice last quarter, then quiet for 74 days. Decay, not death. Move it to a re-engagement flow and let the next real click decide.
Same address. Only one answer tells you what to do.
Export from whatever you use. Mailchimp, Klaviyo, HubSpot, or the spreadsheet a colleague emailed you in 2019. We do not judge the source, only the addresses.
Up to 1 million rows. We start working the moment your file lands and email you when it’s done.
Drag in a CSV or XLSX. One column of addresses, headers optional. Up to 1 million rows per upload. Extra columns ride along untouched in your export.
Your list is encrypted, deleted after 60 days, and never resold or used to train or build anything else we sell. We don’t share it for marketing.
Drop multiple CSV files at once and we’ll merge them. Using an ESP we haven’t listed? Tell us which one and link the API docs, and we’ll build the connection. Next sender on that ESP gets it ready-made.
Drop your list here.
CSV or XLSX, up to 1 million rows. First 1,000 emails free.
Validation asks one question: does this mailbox exist? We ask dozens. Is the domain still alive? Did it surface in a known data breach? Is the domain a defunct ISP or a privacy relay?
We cross-reference every address against breach data, list circulation signals, ESP-shared deliverability data, and provider behavior. Engagement, history, reputation. The signals validators don’t surface, the ones that drag down your sender reputation before the inbox decision is even made.
You don’t have to babysit it. Upload, walk away, and we’ll email you when your list is done, whether that’s two minutes or two hours.
Every report has an SOS button. Tap it for a sanity check on a send, a second look at a verdict, help thinking through your next move, or a hand-built re-engagement plan around the Keeps and Monitors you most want to win back. Real human, not a chatbot, straight to me or the team. Anytime.
The mechanism
Validation runs a probe. We pull memory. Whether the address turned up in a known breach. Whether it shows up scraped across the open web. Whether it has been flagged as a complainer in shared deliverability data.
Retired mailboxes get reused. The address that was safe six months ago can hurt you today.
Every domain has a posture. How it authenticates, who hosts it, how it has been handling the senders it has seen. A validator cannot read posture. We can.
Today, our checks run on every address automatically. If something needs context only a human can give (your industry, your list shape, your goal), YT does the second pass herself.
Soon, with RME Insights, the engine cross-references your ESP’s own data (opens, clicks, complaint counts) so more of the second pass happens automatically. Automation handles the codifiable patterns. I stay for the rest, to sit with the data when a tool can’t, and for the moments you’d rather hear it from a human.
04From shrug to segment
Every validator gives you the same four words: deliverable, undeliverable, risky, unknown. Two of them are useful. Two of them are a shrug.
“Risky” and “unknown” are a traffic light stuck on yellow. Send and hope. Don’t send and lose a real subscriber. The other two aren’t safer than they look. Some addresses validators tell you to keep should be suppressed. Some they tell you to suppress are real subscribers. Without context, every verdict is a guess.
4 addresses · 0 reasons · 0 next moves
“Send and hope. Or don’t, and lose a real subscriber.”
4 addresses · 4 labels · 4 next moves
“Three to a re-engagement flow. One to the suppression list.”
RME shows the homework. Verdict, label, and the reason behind it.
The same address that came back “risky” from a validator comes back from RME as Saturated Inbox or Compromised Address or Spam Report Risk, with the signal behind it. You stop guessing and start segmenting.
Keep means active mailbox, healthy MX, no complaint history. Send with confidence.
Monitor means proceed carefully. A role address that still opens but never clicks, or a domain whose MX flipped to a new provider in the last 90 days. Send to it, then watch.
Suppress means stop. NXDOMAIN since 2022, or a hard bounce on record. Keep sending and you will damage your sending reputation.
Each verdict carries a label with the action it implies. These are some of the ones you’ll see, not the whole set:
Disposable
Throwaway service address. They are gone the moment they signed up.
Suspicious Signup
Pattern matches keyboard mashes, profanity, or bots.
Compromised Address
Appeared in a known breach corpus.
Spam Report Risk
Associated with spam complaints in shared deliverability data.
Saturated Inbox
Appears across many marketing lists or scraped sources.
Privacy Email
Routed through Apple Hide My Email, DuckDuckGo, or Mozilla Relay. Engagement signals degrade.
Legacy Inbox
Domain belongs to a defunct or acquired ISP. Still accepts mail but engagement lags.
Academic · Government · Military
Institutional context. The same person at .gov or .mil is a different deliverability story than at gmail.com.
Most addresses get more than one label.
An info@ that also appeared in a 2023 breach gets both Role Account and Compromised Address. The verdict combines them.
Every customer’s weird edge case becomes everyone’s protection. When we spot a pattern the existing labels can’t explain, a new gambling shape, an ESP quirk, a throwaway we haven’t seen before, it gets its own label. Once it’s in the library, it works for the next list, and the one after that. That’s how the count keeps climbing.
You stay in control of the verdicts. While your list is in your account, you can flip any label (e.g. Government from Suppress to Monitor), regenerate the report, and re-download. Your context, your call.
05The deliverables
Three action files. Four receipts.
Talk to a human
Sometimes the report raises a question only context can answer. Different senders have different lists, target markets, and goals. If your report needs a human eye, YT will review your list herself. No bot, no scheduled meeting, just a real look from someone who has seen this before.
Have YT review your listNew questions, deliverability shifts at Gmail and Outlook, and any tool that landed since the last issue. No fluff, no upsell.
Upload your list. Get verdicts you can act on. Free to start, no credit card.
Clean 1,000 addresses freeHalf your list came back “risky” and nobody said why. That’s not a mystery. It’s a verdict waiting for its name.
Upload the list. I’ll name every verdict.
Yanna-Torry Aspraki
Founder, Review My Emails
