Most cold email teams track the wrong metric. Open rate is broken by Apple MPP. Click rate barely applies to cold email. The metrics that actually tell you whether your outbound is working are reply rate, positive reply rate, bounce rate, and meetings booked. This guide explains each metric, what it tells you, what levers move it, and how to build a performance dashboard that gives you real signal.
Every reply requires the email to have been read and the recipient to have been motivated to respond. This is the cleanest signal of how well your copy and targeting work together. It is not inflated by bot or prefetch activity.
Replies that express interest, not unsubscribes or negative replies. This is the metric most directly correlated with pipeline generated. If reply rate is 5% but only 5% of replies are positive, your offer is not connecting.
Every bounce above 2% damages domain reputation which reduces inbox placement for future campaigns. Monitor after every campaign. If above 3%, stop sending and verify the list before resuming.
Apple Mail Privacy Protection prefetches open pixels for every email, causing all Apple Mail recipients to appear as “opens”. True open rate is 15-30 percentage points lower than reported in most tools. Use open rate to compare relative subject line performance, not as an absolute benchmark.
The metric your manager cares about. Set a weekly meetings-booked target and work backwards to the email volume and conversion rates needed to hit it.
Visible via Google Postmaster Tools (domain reputation) and inbox placement testing tools (GlockApps). Not directly measurable from most sending tools. Track domain reputation in Postmaster as a proxy.
| Metric | Track | Healthy | Investigate if | Where to find it |
|---|---|---|---|---|
| Reply rate | Weekly | 3-5% | Below 1% | Sending tool campaign analytics |
| Positive reply rate | Weekly | 0.5-2% | Below 0.2% | Tag replies in CRM or manually in sending tool |
| Bounce rate | Per campaign | Under 2% | Above 3% | Sending tool bounce report |
| Meetings booked | Weekly | Per target | Miss target 2 weeks in a row | CRM - calendar source = “cold email” |
| Domain reputation | Weekly | High (Google) | Medium or Low | Google Postmaster Tools |
| Spam complaint rate | Weekly | Under 0.1% | Above 0.1% | Google Postmaster Tools |
| Blacklist status | Monthly | Not listed | Any listing | MXToolbox Blacklist Check |
Apple Mail Privacy Protection (MPP), introduced in iOS 15 and macOS Monterey, prefetches remote content - including tracking pixels - for every email, even if the recipient never opens it. This marks every Apple Mail user as an “open,” whether they read the email or not. In most B2B lists, 40-60% of recipients use Apple Mail, inflating reported open rate significantly.
Use open rate only for relative comparison - if open rate drops significantly (30%+) between two campaigns, that signals something changed (different subject line, different audience, deliverability issue). Use reply rate as your primary signal of whether the email is being read and resonating. Do not use open rate as an absolute performance benchmark.
High bounce rate damages inbox placement, which reduces your ability to generate the reply rate and meeting rate numbers you are tracking. Fix bounce rate first - verify before every campaign. 100 free credits, no card required.
Strategy, writing, sequences, and lead generation
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