Deliverability bukan magic. Adalah hasil dari 50+ checkpoints yang dikerjakan dengan benar, dipantau secara konsisten, dan dioptimasi berdasarkan data. Audit ini adalah panduan lengkapnya.
Anda sudah setup SPF, DKIM, DMARC. Sudah warm up IP. Sudah bersihkan list. Tapi inbox rate masih stuck di 70-80%. Apa yang terlewat?
90% masalah deliverability adalah kombinasi dari 10+ small issues, bukan satu masalah besar. Checklist ini akan membantu Anda identify blind spots dan prioritize fixes dengan impact tertinggi.
🎯 Goal Audit Ini
- Inbox rate: 70% → 95%+
- Bounce rate: <0.5% (hard), <2% (soft)
- Spam complaint: <0.1%
- Delivery time: <30 detik (transactional), <5 menit (marketing)
🔐 Section 1: Domain & DNS (Poin 1-12)
📋 Domain Authentication
- [1] SPF record valid (single record, max 10 lookups)
- [2] DKIM 1024-bit minimum, properly rotated tiap 6 bulan
- [3] DMARC policy
p=none→ targetp=rejectdalam 90 hari - [4] Alignment strict (From domain = DKIM domain = SPF domain)
- [5] PTR record valid dan FCrDNS confirmed
- [6] MX record konsisten dengan sending infrastructure
- [7] TTL optimized (300 saat testing, 3600 production)
- [8] No DNSSEC issues (jika enabled)
- [9] BIMI setup (optional tapi recommended untuk brand)
- [10] Subdomain segregation (transactional vs marketing)
- [11] Domain age >30 hari (new domain = suspicious)
- [12] No recent domain ownership change
# Check SPF
dig TXT yourdomain.com | grep "v=spf1"
# Check DKIM
dig TXT default._domainkey.yourdomain.com
# Check DMARC
dig TXT _dmarc.yourdomain.com
# Check PTR
dig -x YOUR_IP
# Check FCrDNS
dig PTR_IP && dig A RESULTING_DOMAIN (should match original IP)
⚙️ Section 2: Infrastructure & IP (Poin 13-22)
📋 IP & Server Setup
- [13] Dedicated IP (bukan shared untuk volume >10K/hari)
- [14] IP warmed up properly (minimum 21 hari untuk volume tinggi)
- [15] IP not blacklisted (check 50+ RBLs)
- [16] Reverse DNS match sending domain
- [17] TLS 1.2+ enforced (no fallback to plain text)
- [18] Server hostname match PTR record
- [19] Connection pooling optimized (max 100 concurrent)
- [20] Throughput throttling by provider (Gmail, Yahoo limits)
- [21] Backup IP ready untuk failover
- [22] Geographic proximity (POP dekat target audience)
# MXToolbox multi-RBL check
curl "https://mxtoolbox.com/api/v1/lookup/blacklist/YOUR_IP"
# Manual check common RBLs
dig +short A 192.168.1.1.zen.spamhaus.org
dig +short A 192.168.1.1.b.barracudacentral.org
🛡️ Section 3: Authentication & Security (Poin 23-30)
📋 Security & Compliance
- [23] SPF include tidak exceed 10 DNS lookups
- [24] DKIM key rotation schedule (calendar reminder)
- [25] DMARC reporting mailbox monitored weekly
- [26] ARC (Authenticated Received Chain) jika forwarding
- [27] MTA-STS policy published (enforce TLS)
- [28] TLS-RPT reporting untuk TLS failures
- [29] No open relay (test dengan telnet dari external IP)
- [30] SMTP AUTH required (no anonymous sending)
✍️ Section 4: Content & Creative (Poin 31-38)
📋 Email Content Quality
- [31] Spam score <5 (Mail-Tester, GlockApps)
- [32] Text-to-image ratio 60:40 minimum
- [33] No URL shorteners (bit.ly, etc)
- [34] All links HTTPS dengan valid SSL
- [35] Alt text untuk semua images
- [36] Plain text version included (multipart/alternative)
- [37] Subject line 30-50 karakter (mobile-friendly)
- [38] No spam trigger words (FREE!!!, Act Now, Guaranteed)
# Mail-Tester
https://www.mail-tester.com/
# GlockApps Inbox Placement
https://glockapps.com/
# Subject Line Tester
https://sendcheckit.com/
👥 Section 5: List Quality & Hygiene (Poin 39-44)
📋 List Health
- [39] Double opt-in untuk semua subscriber baru
- [40] Hard bounce auto-suppress immediate
- [41] Soft bounce retry max 5x kemudian suppress
- [42] Spam complaint auto-suppress & alert
- [43] Unengaged (180+ days no open) sunset atau re-engage
- [44] Role emails removed (info@, admin@, etc)
📊 Section 6: Reputation Monitoring (Poin 45-50)
📋 Monitoring & Feedback Loops
- [45] Google Postmaster Tools configured & monitored
- [46] Microsoft SNDS registered & monitored
- [47] Yahoo Complaint Feedback Loop (CFL) registered
- [48] DMARC reports parsed & reviewed weekly
- [49] Inbox placement tests monthly (seed list)
- [50] Sender Score monitored (target >90)
🎯 Scoring & Prioritasi
| Score | Status | Action | Expected Impact |
|---|---|---|---|
| 48-50 | 🟢 Excellent | Maintain, optimize incremental | Inbox rate 95-98% |
| 40-47 | 🟡 Good | Fix 3-5 high-impact items | Inbox rate 85-95% |
| 30-39 | 🟠 Needs Work | Fix 10+ items, focus authentication | Inbox rate 70-85% |
| 20-29 | 🔴 Critical | Major overhaul, potential blacklist | Inbox rate 50-70% |
| <20 | ⚫ Emergency | Stop sending, full audit + recovery | Inbox rate <50% |
🛠️ Tools untuk Audit
| Tool | Checks | Cost |
|---|---|---|
| MXToolbox | SPF, DKIM, DMARC, Blacklist, SMTP | Free / Freemium |
| Google Postmaster | Domain reputation, spam rate, encryption | Free |
| Mail-Tester | Content spam score, authentication | Free |
| GlockApps | Inbox placement, seed testing | Freemium |
| Sender Score | IP reputation (Return Path) | Free |
| SMTPku Audit | 50-point comprehensive check | Free |
🤖 Automation: Jangan Audit Manual Setiap Bulan
Setup monitoring yang berjalan otomatis:
# Daily automated checks
- DNS record validation (SPF/DKIM/DMARC)
- Blacklist monitoring (50+ RBLs)
- SSL certificate expiry
- Domain expiry check
# Weekly reports
- DMARC report parsing
- Engagement trend analysis
- Bounce rate by campaign
- Spam complaint rate
# Monthly deep dive
- Inbox placement test (seed list to 10 providers)
- Content spam score test
- IP reputation check
- Competitive deliverability benchmark
🩺 Comprehensive Audit Gratis
Tim SMTPku akan menjalankan 50-point checklist ini untuk domain Anda. Report lengkap dengan prioritasi fixes dan timeline implementasi.
Mulai Audit Gratis →❓ FAQ: Deliverability Audit
Berapa sering harus audit deliverability?
▼
Deep audit: quarterly. Quick checks: weekly. Continuous monitoring: daily automation. Post-major-change (domain migration, IP change, new template): immediate full audit.
Apakah score 50/50 guarantee inbox rate 100%?
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Tidak ada guarantee 100%. Provider email punya algoritma proprietary. Tapi score 50/50 dengan engagement baik (open >20%, complaint <0.1%) akan menghasilkan inbox rate 95%+ untuk Gmail/Yahoo.
Audit sendiri vs third-party service?
▼
Audit sendiri untuk monitoring rutin, third-party untuk validation dan blind spots. SMTPku audit gratis memberikan external perspective dan benchmark dengan 1000+ domain lain.
Berapa lama implementasi fixes dari audit?
▼
Quick wins (DNS, content): 1-2 hari. Medium (infrastructure, warming): 1-2 minggu. Major (reputation recovery): 1-3 bulan. Prioritaskan by impact vs effort.
Apakah audit perlu untuk transactional-only sender?
▼
Ya, tapi fokus berbeda. Transactional butuh Section 1 (DNS), 2 (Infrastructure), dan 6 (Monitoring) lebih ketat. Content dan list hygiene less critical karena expected oleh recipient.
