MetricsReviewed by Deliverability Engineering4 min read

Click-Through Rate (CTR)

Email Click-Through Rate

Definition:Click-Through Rate is the percentage of delivered emails where the recipient clicked on one or more hyperlinks included in the message body.

Deliverability Impact
Medium
Implementation Time
Ongoing
Key Industry & Algorithm Benchmarks
Recommended Step 1 Links
0 Links
Plain text delivers highest primary inbox placement
Follow-up CTR Benchmark
1.5% – 3.5%
For relevant case study / asset links in Step 2+
Pro Tip from the Trenches

Disable open and click tracking on Step 1 of your cold email campaigns. Removing tracking pixels and link redirects increases primary inbox placement by 15–20% on Google and Microsoft enterprise accounts.

Frequently Asked Questions about Click-Through Rate (CTR)

Yes. Links increase the spam score calculated by security filters, especially if tracking redirects or unauthenticated domains are used.

Detailed Technical Breakdown

CTR is calculated as `(Total Clicks / Total Delivered Emails) * 100`. In cold outbound sales, including links in initial touchpoints is generally discouraged because links trigger spam filter scrutiny and distract prospects from directly replying.

Security gateways (like Mimecast, Barracuda, and Microsoft Defender) scan every link in incoming cold emails, checking URL reputation and following redirect chains before allowing the message into the inbox.

When tracking is enabled, outreach platforms rewrite standard links into custom tracking URLs, which can degrade deliverability if shared across multiple users.

Why it matters for Cold Email & Deliverability

While valuable for marketing newsletters, tracking links via shared redirect domains hurts cold email deliverability. Plain-text cold emails with zero links achieve higher primary inbox placement.

Clicking a link does not generate pipeline; booked meetings do. Optimizing for direct conversational replies produces superior revenue conversion.

How to optimize Click-Through Rate (CTR)

  1. Eliminate links and tracking pixels from initial cold touchpoints (Step 1) to maximize deliverability and direct reply conversion.
  2. Share links, video assets, or case studies only after a prospect expresses interest in a follow-up interaction.
  3. If links are necessary in later follow-ups, ensure your Custom Tracking Domain (CTD) has a valid SSL certificate.
  4. Never use public link shorteners (bit.ly, tinyurl) in any outbound cold outreach.

Common Click-Through Rate (CTR) Mistakes

  • Inserting multiple promotional links, social media icons, and raw Calendly links in initial cold emails.
  • Relying on default shared tracking domains that have been flagged by other spammers.
  • Treating CTR as a primary outbound sales metric instead of Positive Reply Rate.