Before you hire a deliverability consultant

Deliverability consultants are a legitimate profession and the good ones earn their fees. The catch is that a retainer with a respected consultant starts at roughly $5,000/month and climbs fast, and the first two weeks of that engagement are almost always spent on things you could have done yourself in an afternoon. This article is the afternoon. Run the checklist before the kickoff call and you'll either solve the problem for free or walk into the engagement with ten weeks' worth of head start.

Step 1: Define the problem in one sentence

Consultants charge by the week. The fastest way to burn a week is to show up with a fuzzy complaint. Write down, in one sentence, what is actually wrong. Good examples:

• "Our welcome sequence open rate dropped from 42% to 18% starting March 3 with no content changes."
• "Cold outreach from our sales domain was 68% inbox at Gmail in November, 12% in January."
• "Microsoft has been rejecting 30% of our transactional mail with a 550 5.7.1 since the domain migration on the 15th."

Bad examples: "Our deliverability is bad." "Something changed." "Reply rates are down." If you can't articulate the problem in one sentence with a metric and a date, you don't yet know what the problem is — and the first thing any good consultant will do is make you define it. You can do that for free.

Step 2: Run the six standard checks

Almost every consultant's initial diagnostic report covers the same six things. You can run them yourself:

1. Authentication: SPF, DKIM, DMARC all pass? Free test here.
2. Inbox placement across 20+ providers — same tool above.
3. Gmail Postmaster Tools: domain reputation, IP reputation, spam rate?
4. Microsoft SNDS (if dedicated IP) or plain reputation lookup (if shared)?
5. Blocklist status: are you on any of the big 50 public blocklists?
6. List hygiene: bounce rate, complaint rate, inactive percentage for the last 3 campaigns?

Compile the six results into a single doc. This is literally the deliverable a $2,000 initial diagnostic would produce. You just saved two grand.

Step 3: Build a timeline of changes

Deliverability problems almost always correlate with a change. Consultants spend a disproportionate amount of billable time asking you what changed when. You can save them (and you) that time by producing the timeline yourself. Go back 90 days and note:

• Every change to SPF, DKIM, or DMARC records
• Every new vendor added to SPF or sending on your behalf
• Every ESP switch or added ESP
• Every domain, subdomain, or IP change
• Every major list import or sudden audience growth
• Every campaign that got an unusually high complaint or unsub rate
• Any incidents: blocklist listing, postmaster alert, sudden metric shift

Line them up chronologically. Sometimes the problem is obvious just from looking at the timeline. A rebrand on January 15 followed by open rates tanking on January 20 doesn't need a consultant — it needs you to reinstate the old DKIM key or wait four weeks for the new domain to warm up.

Step 4: Try the three cheapest fixes

Most deliverability problems are fixed by one of three boring actions. Try all three before escalating:

1. Remove inactive subscribers. Anyone who hasn't opened or clicked in 180 days. Yes, even the ones you paid for. Filters use engagement signals, and a dead list drags everything with it.
2. Warm up more slowly. If you grew volume 20% week over week, back off to 10%. Filters punish volume growth that outpaces engagement growth.
3. Fix the lowest-hanging auth issue. If DMARC is at p=none, leave it. If DKIM is misconfigured on one sending domain, fix it. If SPF has too many DNS lookups, consolidate.

Give each fix two weeks to show up in the numbers. In roughly 60% of cases this resolves the problem without further help. In the other 40% you now have clean baseline data to hand the consultant.

Step 5: Write the consultant brief

If after all of the above you still have a problem, congratulations — this is a real deliverability project and a consultant is probably worth it. Write the brief yourself. It should include:

• The one-sentence problem statement
• The six-check diagnostic doc
• The 90-day timeline
• The three fixes you've already tried and their outcomes
• Your sending volume, ESP, domains, and business context
• What a successful outcome looks like (a number, not a feeling)

A consultant who receives this brief will cut their discovery phase from two weeks to two days and start returning value in week one. A consultant who doesn't will spend week one making you produce it anyway.

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