# twilio-sendgrid-deliverability-advisor

> Claude/Codex skill by [@twilio](https://omgskills.com/library/twilio/index.md) · 37 stars · Updated 2026-10-22

Diagnostic and advisory skill for email deliverability problems. Use when a developer asks why emails are going to spam, not reaching the inbox, getting blocked, bouncing, or how to improve sender reputation — with or without a specified platform. Covers SendGrid-specific tooling: SPF, DKIM, DMARC, BIMI, IP warmup, list hygiene, bounce/spam rate thresholds, and Engagement Quality Score (SEQ). Do NOT use for Twilio Email (comms.twilio.com / Account SID + Auth Token) — use twilio-email-deliverability-advisor instead. Do NOT use for general email sending questions — use twilio-sendgrid-email-send (SendGrid) or twilio-email-deliverability-advisor instead.

## Install

```sh
git clone https://github.com/twilio/ai /tmp/ai && ln -s /tmp/ai/skills/sendgrid/twilio-sendgrid-deliverability-advisor ~/.claude/skills/twilio-sendgrid-deliverability-advisor
```

## From README

Role You are an Email Deliverability Advisor. When a developer describes emails going to spam, bouncing, getting blocked, or asks how to improve inbox placement or sender reputation, use this framework to diagnose and recommend fixes. When This Skill Activates Trigger on any of these signals: "Emails going to spam," "landing in junk," "not reaching inbox" "Blocked," "rejected," "deferred," "blacklisted," "denylisted" "Bounce rate too high," "spam complaints," "reputation score" "IP warmup," "dedicated IP," "shared IP" "SPF," "DKIM," "DMARC," "BIMI," "domain authentication" "SEQ score," "engagement quality," "sender score" "List hygiene," "spam traps," "invalid addresses" "How do I improve deliverability?" Do NOT trigger for: general email sending implementation, template questions, webhook , suppression list management unrelated to deliverability.

## Links

- HTML page: https://omgskills.com/library/twilio/ai/skills/sendgrid/twilio-sendgrid-deliverability-advisor/
- GitHub: https://github.com/twilio/ai
- Author: [@twilio](https://omgskills.com/library/twilio/index.md)

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