CMassBeta
← All guides
Analytics4 min read

Track opens, clicks, and replies

Understand what happens after you hit send — who opened, who clicked, who replied, and who bounced.

CMass tracks engagement for every email in a campaign — open rate, click rate, reply rate, and bounces. This data appears in the CMass popup (click the toolbar icon) and on the CMass dashboard.

Open tracking

CMass tracks opens by embedding a tiny invisible image (a 1×1 pixel) in each email. When the recipient's email client loads images, our server receives a request — we record this as an open. Toggle 'Track Opens' in the Template tab to enable or disable this per campaign.

⚠️ Open tracking is not 100% accurate. Apple Mail's Mail Privacy Protection (MPP), introduced in 2021, pre-fetches images on Apple's servers before delivering email — this makes every Apple Mail email appear 'opened' regardless of whether the recipient actually read it. Open rate is a useful directional metric but not a precise count.

Click tracking

When click tracking is enabled, CMass rewrites every URL in your email body through a tracking redirect. When a recipient clicks a link, our server records the click and immediately redirects them to the original URL. The recipient reaches the right page without any noticeable delay.

Reply tracking

Reply tracking works differently — CMass monitors your Gmail inbox (via the Gmail API) for replies to campaign emails. When a reply is detected, CMass marks that recipient as 'replied' and stops any pending follow-ups to them automatically. No configuration needed.

Bounce tracking

CMass monitors for Gmail bounce notifications (the automated 'Mail Delivery Subsystem' messages Gmail sends when an email can't be delivered). Hard bounces — invalid email addresses — are flagged in your campaign stats. Contacts who hard-bounced are suppressed from future campaigns automatically.

Reading your stats

Click the CMass toolbar icon and select a campaign to see its stats:

  • ▸Sent — number of emails delivered
  • ▸Opened — unique opens (one per recipient, not counting multiple opens from the same person)
  • ▸Clicked — recipients who clicked at least one link
  • ▸Replied — recipients who replied to any email in the campaign
  • ▸Bounced — emails that couldn't be delivered
  • ▸Unsubscribed — recipients who clicked the unsubscribe link

Benchmark numbers

Here's what good looks like for cold outreach:

  • ▸Open rate: 40–60% is strong (remember, Apple MPP inflates this number)
  • ▸Click rate: 3–8% for cold outreach, 10–20%+ for warm lists
  • ▸Reply rate: 3–8% for cold, 15–30%+ for warm or highly personalized campaigns
  • ▸Bounce rate: keep below 2% — higher rates damage your sender reputation
✅ Low open rate?: If your open rate is below 20% (excluding Apple MPP inflation), focus on your subject line first. A/B test two different subject lines by splitting your list and running two campaigns. Subject line is the single biggest lever for open rate.

Try it in Gmail — free

50 emails/day on the free plan. No credit card needed.

Add CMass to Chrome →
← Back to all guides