--- title: "Email Domain Setup Checklist (2026)" description: "15-step checklist for email domain setup. Domain purchase, DNS configuration, warmup, and common mistakes to avoid." canonical: "https://www.inboxkit.com/learn/email-domain-setup-checklist" author: "Saksham Jain" published: "2026-03-31" updated: "2026-07-29" category: "Guides" --- # Email Domain Setup Checklist: 15 Steps (2026) Every step from buying a domain to sending your first campaign. Based on 10,000+ domain setups on InboxKit. ## The Complete 15-Step Checklist Based on 10,000+ domain setups on InboxKit. | Step | Task | Time | InboxKit Automated? | Common Mistake | |------|------|------|-------------------|----------------| | 1 | Choose domain name | 5 min | Search tool | Using exact brand names | | 2 | Select extension (.com/.co) | 2 min | TLD filter | Choosing .xyz (low trust) | | 3 | Purchase domain | 2 min | In-app | Overpaying at registrars | | 4 | Point nameservers | 5 min | Automatic | Wrong NS, 48h propagation | | 5 | Configure SPF | 3 min | **Automatic** | >10 DNS lookups (RFC 7208) | | 6 | Configure DKIM | 3 min | **Automatic** | Wrong selector, weak key | | 7 | Configure DMARC | 2 min | **Automatic** | Starting with p=reject | | 8 | Set up MX records | 2 min | **Automatic** | Missing MX = no replies | | 9 | Create mailboxes (3/domain) | 5 min | **Automatic** | >5 per domain (risky) | | 10 | Set profile pictures | 3 min | Bulk upload | Skipping (hurts trust) | | 11 | Configure MFA | 2 min | **Automatic** | Skipping (Google flags) | | 12 | Start warmup | 1 min | $3/mailbox/mo | Skipping warmup entirely | | 13 | Connect sequencer | 3 min | One-click export | Wrong SMTP settings | | 14 | Set up domain forwarding | 2 min | Dashboard | No website on domain | | 15 | Enable monitoring | 1 min | InfraGuard | No monitoring = blind | | **Total** | | **~40 min manual** | **~10 min InboxKit** | | **Source:** InboxKit Quick Setup wizard automates steps 4-12. DNS record formats per Google Workspace Admin Help (support.google.com/a/answer/33786). ## Domain Extension Impact on Deliverability Extension choice matters more than most people think. | Extension | Inbox Rate | Cost/Year | Recommendation | Source | |-----------|-----------|-----------|---------------|--------| | .com | 85-95% | $12-15 | **Best if available** | InboxKit IPT data | | .co | 82-92% | $8-10 | **Great alternative** | InboxKit IPT data | | .io | 80-90% | $30-40 | Good for tech | InboxKit IPT data | | .net | 78-88% | $12-15 | Acceptable | Industry data | | .xyz | 60-75% | $1-3 | **Avoid** | Validity 2025 | | .info | 55-70% | $2-5 | **Avoid** | Validity 2025 | **Why .xyz and .info perform poorly:** These extensions are heavily used by spammers due to low cost. ISPs have learned to be suspicious of them. Source: Validity 2025 Deliverability Report. ## Mailbox Density: How Many Per Domain The number of mailboxes per domain affects deliverability risk. | Mailboxes/Domain | Risk | Volume/Day | Best For | |-----------------|------|-----------|----------| | 1-2 | Very Low | 30-60 | Conservative | | **3** | **Low** | **90** | **Recommended** | | 4-5 | Medium | 120-150 | With monitoring | | 6-10 | High | 180-300 | Agencies only | | 10+ | Very High | 300+ | Not recommended | **Why 3 is the sweet spot:** 3 mailboxes x 30 emails/day = 90/day per domain. At $2.50/mailbox: $8.97/mo per domain. Cost-effective without reputation risk. Source: InboxKit recommended setup, aligned with Instantly and SmartLead best practices. ## Warmup Timeline Don't skip warmup. The data is clear. | Day | Volume/Mailbox | Inbox Placement | Activity | |-----|---------------|----------------|----------| | 1-3 | 5/day | 40-60% | Warmup only | | 4-7 | 10-15/day | 55-70% | Warmup + light testing | | 8-14 | 15-25/day | 70-85% | Small campaigns OK | | 15-21 | 25-40/day | 80-90% | Ramp campaigns | | 22-30 | 30-50/day | 85-95% | Full volume | InboxKit warmup: $3/mailbox/month, isolated pools (not shared). Source: InboxKit warmup data across 5,000+ cycles. ## Total Cost Calculator What it actually costs to set up email infrastructure. | Scale | Domains | Mailboxes | Domain Cost | Mailbox Cost | Warmup | **Total/Month** | |-------|---------|-----------|------------|-------------|--------|----------------| | Starter | 4 | 12 | $4/mo | $35.88 | $36 | **$75.88** | | Growth | 12 | 36 | $12/mo | $107.64 | $108 | **$227.64** | | Scale | 28 | 84 | $28/mo | $251.16 | $252 | **$531.16** | | Agency | 56 | 168 | $56/mo | $502.32 | $504 | **$1,062.32** | **Math:** Domain ~$12/year = $1/mo. Google Workspace $2.50/mailbox/mo. Warmup $3/mailbox/mo. Source: InboxKit pricing (inboxkit.com). No platform fees, no minimums. ## Frequently asked questions ### How long does full setup take? 10 minutes with InboxKit (automated DNS), then 14 days warmup before first campaign. Manual setup: 40-60 minutes + same warmup. ### How many domains for 1,000 emails/day? About 12 domains with 3 mailboxes each (36 mailboxes x 30/day = 1,080/day). Cost: ~$228/mo on InboxKit. ### Can I skip warmup? You can but inbox placement drops from 85-95% to 15-35%. The 14-day warmup is the difference between campaigns that work and campaigns in spam. ### Google or Microsoft? Both work. Use 70% Google + 30% Microsoft for provider diversity. InboxKit plans start at $39/mo and support Google, Microsoft, and Azure. Google warms up faster; Microsoft has higher daily limits. ### What's the cheapest way to start? 4 domains, 12 Google mailboxes: $35.88/mo for mailboxes + $36/mo for warmup ($3/mailbox/mo add-on) = $75.88/mo total with warmup. Sends ~360 emails/day safely. ## Sources - [Google Workspace Admin Help](https://support.google.com/a) (2026) - [RFC 7208 SPF](https://datatracker.ietf.org/doc/html/rfc7208) (2026) - [RFC 6376 DKIM](https://datatracker.ietf.org/doc/html/rfc6376) (2026) - [RFC 7489 DMARC](https://datatracker.ietf.org/doc/html/rfc7489) (2026) - [InboxKit DNS Docs](https://docs.inboxkit.com) (2026) ## Related - https://www.inboxkit.com/learn/email-infrastructure-setup-guide - https://www.inboxkit.com/learn/dns-setup-guide - https://www.inboxkit.com/learn/how-many-domains-email