Most deliverability content is written by specialists for specialists. It dives into DKIM key rotation schedules, DMARC report aggregation, BIMI VMC procurement. These are real topics, and your eventual specialist will handle them. As a founder or first marketing hire, they're not your job.
Your job is to do the five things that cover 90% of deliverability outcomes, in the right order, and resist the pull to go deeper before you've done them. Here they are.
Priority 1: Authenticate once, correctly
SPF, DKIM, DMARC. Three DNS records. Set once by your ESP, your domain admin, or a technical friend over an afternoon. Not your ongoing job, but you should verify they're set.
You don't need to understand the syntax. You need a green checkmark on all three from a tool like Inbox Check or MXToolbox. If any shows red, it stays at Priority 1 until fixed. Nothing else on this playbook matters without clean authentication.
Paste a sample email into Inbox Check. The result page shows SPF, DKIM, and DMARC status for every major provider. If any is red, screenshot it and hand it to whoever manages your domain. Don't proceed to Priority 2 until all three are green.
Priority 2: Ramp volume like a human
The single most common deliverability mistake: a new domain sending 500 emails/day from day one. Providers read this as spam pattern and drop placement below 30%.
The rule is simple enough to skip the deep technical version:
- Day 1–7: send under 50/day. Only to warm recipients (people who know you).
- Week 2: 100–200/day. Start mixing in cold.
- Week 3: 300–500/day. Mostly cold is OK if authentication and content are clean.
- Week 4+: scale to your target volume.
Tools like Warmup Inbox, Mailwarm, and Lemwarm automate this. They're worth the $50–100/month for the first 60 days of a new domain.
Priority 3: Measure placement weekly
The number on your outreach tool's "delivery" dashboard is not the number you care about. Delivery rate measures SMTP acceptance; placement rate measures whether mail hit the inbox.
Run a seed test weekly. Budget: 3 minutes. A tool like Inbox Check does this in a couple of clicks for free. You're looking for:
- Gmail: 70%+ inbox.
- Outlook: 60%+ inbox.
- Any vertical-specific provider your prospects use (Yandex for Russia, Mail.ru for CIS, GMX for Germany, etc.): 60%+.
Put it on the calendar. Every Monday morning. 3 minutes. You'll catch drift weeks before it kills a campaign.
Priority 4: Keep the list clean
Bad list hygiene is the most common reputation killer after bad authentication. Three rules:
- Never import a purchased list directly. Even "verified" purchased lists contain spam traps. Use an email verification service before sending.
- Remove hard bounces immediately. Any sender address that bounces hard should never be mailed again.
- Honour unsubscribes in 24 hours. Legal requirement in some jurisdictions, reputation requirement everywhere.
Every ESP has built-in suppression for bounces and unsubscribes. Enable it. Don't override. Don't try to "re-engage" hard bounces.
Priority 5: Content that doesn't look like spam
Lowest-priority item because clean auth + good reputation will cover for modest content sins. Still, avoid the obvious:
- No subject lines in ALL CAPS.
- No more than 2–3 links per email for cold outreach.
- Don't send one-big-image emails.
- Always include a plain-text version (your ESP can auto-generate).
- Include a real physical address and a working unsubscribe link.
- Don't use URL shorteners (bit.ly, t.co) in cold email.
Beyond that, write well. "Spam trigger words" lists are mostly myth; modern filters evaluate engagement patterns, not word lists.
What is NOT a priority for you
These belong to your future deliverability specialist, not to you now:
- DMARC report aggregation and analysis.
- DKIM key rotation schedules.
- BIMI and VMC procurement.
- Dedicated IP strategy.
- Feedback-loop configuration (FBL).
- Subdomain segmentation for marketing vs transactional.
All of these are legitimate topics. None of them matter if your Priority 1–5 are broken. Most of them yield incremental gains of a few percentage points after you've already done the fundamentals.
The weekly 15-minute routine
- Monday 3 minutes: run a seed test. Record placement %.
- Monday 2 minutes: check Postmaster Tools (if eligible) and SNDS for any reputation drops.
- Monday 5 minutes: review last week's reply/bounce numbers in your ESP. Remove any new hard bounces from suppression overrides.
- Friday 5 minutes: look at the week's trend. If placement dropped more than 10 points, schedule 30 minutes next week to diagnose. If stable, do nothing.
15 minutes per week is the effort level for a small-team founder to maintain good deliverability. It's cheaper than one bad campaign.
When to escalate
Hire help (ESP support, freelance consultant, agency) when:
- Placement dropped below 40% and your own diagnostics haven't found the cause in 2–3 days.
- You're sending 10,000+/day and need to set up dedicated IP + subdomain strategy.
- A blacklist won't remove you through the standard form.
- You have a DMARC report parse problem and want quarterly insight.
Below those thresholds, the playbook above is enough.