Email deliverability is an intricate game of trust between your sending servers and major inbox providers like Google Workspace, Yahoo, and Microsoft 365.
While most developers understand SPF, DKIM, and DMARC, one of the most frequently overlooked factors in spam scoring is **Tracking Link Domain Alignment**.
---
## Why Shared Tracking Domains Are Dangerous
When you send an email campaign with open and click tracking enabled, your email software automatically rewrites every hyperlink:
- Original link: `https://acme.com/pricing`
- Rewritten tracking link: `https://send.solidrix.com/l/sub123/link456/camp789`
If your email software uses a single shared tracking domain across all of its customers:
1. Every user on the platform sends emails containing links pointing to `send.solidrix.com`.
2. If even **one sender** sends a phishing campaign, spam payload, or gets listed on a spam blacklist, **the entire tracking domain gets flagged**.
3. The moment Spamhaus or Gmail Spam Filter flags `send.solidrix.com`, **every single email sent by all other customers containing that domain gets routed to the Spam folder or rejected completely**.
This is known as **Cross-Tenant Deliverability Contamination**.
---
## The Solution: Mandatory Custom Tracking Domains (CNAME)
To guarantee that your brand’s inbox placement is never impacted by other senders, Solidrix Send enforces **100% Custom Tracking Domain Isolation**:
```
[Your Email Content]
│
▼
Rewritten with YOUR Brand Subdomain:
https://send.yourbrand.com/l/...
│
▼
CNAME DNS Record:
send.yourbrand.com ──> CNAME ──> send.solidrix.com
```
### Benefits of Custom CNAME Tracking:
- **100% Reputation Isolation**: Your tracking domain is unique to your brand. Even if other senders experience issues, your domain reputation remains completely untouched.
- **Brand Consistency**: Your recipients see `send.yourcompany.com` when hovering over links in their email client, increasing click-through confidence and reducing spam reports.
- **DMARC & Alignment Compliance**: Inbox providers award higher trust scores when the From domain, Return-Path, and tracking links share the same root domain.
---
## How to Set Up Your Custom CNAME in 3 Minutes
1. **Choose a Subdomain**: In your Solidrix Send dashboard under Brand Settings, choose a prefix (e.g. `send`, `link`, `track`, or `mail`).
2. **Add the CNAME Record**: In your DNS provider (Cloudflare, AWS Route53, GoDaddy, or Namecheap), add:
- **Type**: `CNAME`
- **Name**: `send` (or your chosen subdomain)
- **Target / Value**: `send.solidrix.com`
- **Proxy status**: DNS Only (if using Cloudflare)
3. **Verify**: Click **"Verify Domain"** in your Solidrix Send dashboard. Our automated verification engine tests DNS propagation instantly.
Protect your domain reputation today — never compromise on tracking link isolation.
