Start with the right data
Upload a supported file and choose the email column. Review the preview before processing so you can catch an incorrect column or unexpected formatting early. Upload only the information needed for your workflow.
Follow the work as it happens
See the state of your job and review available progress information. Larger lists may include queued checks or retries. A temporary delay should remain distinguishable from a completed result.
Review the exceptions first
Filter results to see confirmed address problems, risk flags, and uncertain checks. A smaller set of clear decisions is more useful than one unexplained “clean” number.
Export with context
Choose the results your workflow needs. Where supported, keep original columns and append verification fields rather than losing the information that makes each row useful.
Duplicates, credits, and retries
Review the current credit rules before starting a job. The amount reserved for a list may differ from the final charge when duplicates or non-chargeable outcomes are excluded under your plan. Your usage view should explain the difference.
Should I upload my entire CRM?
Export only the fields you need and have permission to process. Avoid unnecessary personal or sensitive information.
Should I delete every risky address?
No single risk label answers every business question. Review the underlying reason and your relationship with the contact.
A cleaner list. A clearer handoff.
Prepare the file
Keep an email column and a stable record ID. Exclude fields you do not need.
Review each category
Compare invalid records, catch-all domains, and unknown outcomes separately.
Export deliberately
Preserve reasons and join results to your source records without losing suppression rules.
Prepare your CSV before the first check
Create a working copy of the list, identify the email column, and preserve a stable contact identifier. Check the delimiter and encoding if a file opens with broken columns. Remove blank records and review duplicates without combining distinct customer records accidentally.
Review the report before changing your CRM
An invalid address and an unknown result require different handling. Review category totals and a small set of examples before making a large update. Keep the original file so changes can be traced, and maintain a separate suppression decision rather than deleting evidence.
Make the export useful to the next person
A helpful export contains the original address, your record identifier, the outcome, a reason, and the check time. Create separate operational segments where needed. Do not assume everyone receiving the report understands what catch-all means; include the results guide in the handoff.
Questions worth asking
Where do I run a list?
In the app at cp.mailcheckup.net. This site explains the product. The sample report does not check your file.
Does deliverable mean it will hit the inbox?
No. The mailbox server accepted the recipient when asked. It does not predict spam filtering or that a person will read the mail.