Agencies lose billable time on deliverability because the findings live in a terminal, a screenshot, or a Slack thread. A client report fixes that: one page, one score, a prioritized list of fixes, and a date to re-check. Here is the structure that works.
Clients do not care that your SPF has 12 lookups. They care whether their email lands. Open with a single number, a 0 to 100 score, and one sentence: "Your domain passes 5 of 7 checks. The two that fail are putting your marketing email at risk of the spam folder." Everything else is supporting detail.
Seven checks cover almost every real-world failure: SPF (syntax, valid, under the 10-lookup limit), DKIM (present and matching the selector in use), DMARC (present, policy, subdomain coverage), MX (reachable and ordered), TLS (valid certificate, modern protocol), IP reputation (not on a blocklist), and a live send test if you can do one. For each check, show pass or fail, the raw record, and the plain-language meaning of the failure.
Rank the fixes by blast radius, not by how easy they are to explain. A missing DMARC record with p=none means anyone can spoof your domain, so that outranks a cosmetic SPF cleanup. A broken DKIM signature means every email fails authentication at the receiver, so that outranges a subdomain that is not yet covered. Two or three fixes, in order, with the exact record to add or change. Clients act on short lists.
The part that wins the renewal is the re-check. Run the audit, hand the client the fixes, and run it again a week later. A report that goes from 62 to 98 with the same seven checks is the clearest proof of value you can show, and it is the reason monitoring subscriptions renew. Inboxproof Pro does this on a schedule: daily checks, an alert when a record breaks, and a shareable report link you can put in front of the client without logging in.
If the report needs a second page, it is too long. Score, checks, fixes, re-check date. The raw records go in an appendix or a link, not the body. One page is what gets forwarded to the client's boss, and that forward is how you get the next account.
The fastest way to see where you stand is to run the checks now.
Run a free audit of your sending domain. It checks SPF, DKIM, DMARC, MX, TLS and IP reputation in about 30 seconds, no account needed.
Check my domain free