deliverability-manager
Skill9 starsChanged 3 months agoMITView on GitHub
Use when setting up cold email sending infrastructure, configuring DNS records for new sending domains, planning email warmup schedules, or troubleshooting deliverability issues like high bounce rates or spam folder placement
In this repository15 other files it gives its agents.
- AGENTS.mdAGENTS.md
- CLAUDE.mdCLAUDE.md
- champion-trackerSkill
- compliance-managerSkill
- contact-finderSkill
- email-writerSkill
- linkedin-contentSkill
- meeting-followupSkill
- multi-channel-writerSkill
- pipeline-trackerSkill
- prospect-researcherSkill
- resource-offerSkill
- setupSkill
- signal-scannerSkill
- validateSkill
The file
We split this skill into the rules it gives an agent
4 rules. About 0 are common, 3 are distinctive, and 1 is very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈3
Distinctive · estimate
This author's own choices. Worth a look.
1
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Distinctive: line 10
Never send cold email from your primary domain.
- Very specific: line 28
Add the generated TXT record to DNS (key selector: google)
- Distinctive: line 44
Verify all records: MXToolbox → SuperTool → enter domain.
- Distinctive: line 48
Use Instantly.ai's built-in warmup or Mailreach.
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
Deliverability Manager
Domain Strategy
Never send cold email from your primary domain. Buy 3–5 secondary domains. Register via Namecheap or Google Domains.
Set up Google Workspace on each domain. Create 2–3 sending accounts per domain (e.g., sami@, team@, hello@). This gives 6–15 sending accounts total — each capped at 25–30 emails/day at full warmup.
Total capacity at full warmup: 15 accounts × 30 = 450 emails/day.
DNS Configuration
Configure all three records before sending a single email.
SPF — authorizes Google to send on your behalf:
TXT @ "v=spf1 include:_spf.google.com ~all"Why: Receiving servers reject mail from unauthorized senders. ~all is softfail (safer than -all for deliverability).
DKIM — cryptographic signature proving the email wasn't tampered with:
- In Google Workspace Admin → Apps → Gmail → Authenticate email → Generate DKIM key
- Add the generated TXT record to DNS (key selector:
google)
Why: Major providers (Gmail, Outlook) heavily weight DKIM presence for inbox placement.
DMARC — policy for handling SPF/DKIM failures:
TXT _dmarc "v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com; pct=100"Why: Required by Google and Yahoo for bulk senders (>5K/day). Start with p=quarantine, move to p=reject after 30 days of clean reports.
Custom tracking domain (CNAME) — masks tracking links from Instantly.ai:
CNAME track "custom.tracking.instantly.ai"Why: Generic tracking domains are flagged by spam filters. Custom subdomain improves deliverability.
Verify all records: MXToolbox → SuperTool → enter domain.
Warmup Protocol
Use Instantly.ai's built-in warmup or Mailreach. Never skip — domains sent cold from day one get blacklisted.
| Week | Emails/day/account | Action |
| 1–2 | 5 | Warmup only, no prospects |
| 3–4 | 15 | Can begin limited prospect sends |
| 5+ | 25–30 | Full capacity |
Warmup sends go to a pool of real inboxes that auto-open, auto-reply, and mark as not spam. Maintain warmup indefinitely — never turn it off.
Monitoring
Check weekly:
- MXToolbox Blacklist Check — enter each sending domain. If listed: stop immediately, delist, rotate.
- Google Postmaster Tools — connect sending domains. Track domain reputation (aim for High), spam rate (<0.1%).
- Instantly.ai dashboard — bounce rate, open rate, reply rate per campaign.
Thresholds:
- Bounce rate <2%: healthy
- Bounce rate 2–5%: pause and clean list
- Bounce rate >5%: pause campaign, audit list source
Troubleshooting
| Symptom | Diagnosis | Fix |
| High bounce rate | Stale or unverified list | Run ZeroBounce on full list before next send |
| Landing in spam | DNS misconfigured or domain flagged | Recheck SPF/DKIM/DMARC via MXToolbox; pause domain 2 weeks |
| Low open rate | Weak subject line or sending time | A/B test subjects; try 8–9am or 4–5pm recipient timezone |
| Blacklisted | Sent too fast or bad list | Stop all sends from domain; submit delisting request; rotate to backup domain |
| Replies going to spam | Reply-to misconfigured | Set reply-to to primary domain inbox |
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