Email Marketing Audit: What It Is and How to Run One

Your open rate slipped a little last month. Clicks are flat, and sales from email feel slower than they used to. None of it looks like an emergency, but small dips rarely fix themselves.

An email marketing audit is how you find out what is going on. It is a structured review of your email program that checks your data, setup, list, campaigns, and automations to show what is working, what is holding results back, and what to fix next.

Email Audit Engine connects to your Mailchimp account and produces a scored audit of campaigns, automations, deliverability, and subscribers in minutes. It can handle the data side of this review, but the thinking behind it is the same whether you use software or a spreadsheet.

In this guide:

• What is an email marketing audit?
• Why does an audit matter for your results?
• Types of email marketing audits
• What should an email marketing audit include?
• Which metrics should you review?
• How to do an email marketing audit, step by step
• Example: what audit findings look like
• How do you turn findings into fixes?
• How often should you run an email marketing audit?
• What does an email marketing audit cost?
• Running email marketing audits for clients
• What an audit tool can and cannot check
• Frequently asked questions

What is an email marketing audit?

An email marketing audit is a full health check for your email program. It looks at everything that affects results, from the technical setup behind your sending domain to the subject lines your subscribers see. The goal is to replace hunches with evidence.

It helps to separate an audit from a regular report. A report tells you what happened, such as how many people opened last week's newsletter. An audit asks why it happened and what you should change because of it.

Audits can be run by an in-house marketer, an agency, a consultant, or a dedicated audit tool. Whoever runs it, the output should be the same. You end up with a clear, prioritized list of issues and fixes, each tied to an outcome you care about, such as engagement, conversions, or revenue.

Why does an audit matter for your results?

Email problems rarely arrive with a warning label. A two-point drop in opens can be the first sign that your list is aging or that more of your emails are landing in spam. If you only look at the headline numbers, it is easy to miss the cause until it starts costing you sales.

Deliverability is the quiet risk here. When emails go to spam, nothing breaks, and no error message appears. Your campaigns simply reach fewer people, and revenue drops without an obvious reason.

An audit gives you a fixed point to measure against. Instead of guessing why a campaign underperformed, you can see whether the issue sits in your list, your content, your timing, or your setup. That clarity is what turns email into a channel you can plan around, and it is the foundation of long-term email marketing success.

Not sure if it is time? Common warning signs include falling engagement, rising bounces or unsubscribes, more spam complaints, flat revenue from email, or an account you inherited that nobody has reviewed. Any one of them is reason enough to take a closer look.

Types of email marketing audits

Most audits cover the whole program, but you can run a narrower one when you already know where the problem is. These are the common types:

• Deliverability audit: whether your emails reach the inbox. Bounces, spam complaints, sender reputation, and your SPF, DKIM, and DMARC records.
• List health audit: who is on your list, where they came from, and how many have stopped engaging.
• Performance audit: opens, clicks, conversions, and revenue across campaigns and automations, compared with your history and with benchmarks.
• Content and design audit: subject lines, copy, calls to action, mobile display, and accessibility.
• Automation audit: whether your welcome, abandoned cart, and re-engagement flows still trigger, send on time, and convert.
• Compliance audit: consent records, unsubscribe handling, sender details, and the rules inbox providers now enforce.

A full email marketing audit covers all six. Start with deliverability, because a problem there distorts every other number.

What should an email marketing audit include?

A thorough review touches every part of your program, but some areas carry more weight than others. Start with the ones that affect every send, then work toward the details. Here is what a complete audit should include:

• Deliverability and authentication: bounce rates, spam complaints, inbox placement, and your SPF, DKIM, and DMARC records.
• List health: growth, sign-up sources, inactive subscribers, and unsubscribes.
• Campaign performance: opens, clicks, click-to-open rate, conversions, and revenue per email.
• Content and design: subject lines, preview text, copy, calls to action, accessibility, and how emails look on mobile.
• Segmentation and personalization: whether the right people receive the right messages.
• Automations: welcome series, abandoned cart flows, and re-engagement emails, including their triggers and timing.
• Compliance basics: proof of consent, a working unsubscribe link, and clear sender details.

The first item deserves special attention. An email deliverability audit focuses only on whether your emails reach the inbox, and it is often where the biggest wins hide. Authentication records such as SPF, DKIM, and DMARC belong in that review too, because a single error can affect every campaign you send.

Inbox providers now enforce some of these rules. Since February 2024, Google's sender guidelines have required anyone sending 5,000 or more emails a day to Gmail addresses to authenticate with SPF, DKIM, and DMARC, offer one-click unsubscribe, and keep spam complaints low. Yahoo's rules are similar and ask senders to honor unsubscribes within two days. If you email people in the EU or the UK, check your consent records against GDPR. If you email California residents, check that you can handle CCPA data requests.

Which metrics should you review?

Metrics are only useful when you know what each one is telling you. A long dashboard with no structure creates more confusion than clarity. Group the numbers by the question they answer, and the picture gets much clearer.

Delivery metrics show whether your emails arrive. Look at hard bounces, which are permanent failures such as an address that no longer exists, and soft bounces, which are temporary problems such as a full inbox. Spam complaint rate belongs here too, because complaints damage your sender reputation fast.

Engagement metrics show whether people care. Open rate, click rate, and click-to-open rate are the core trio. Treat opens with some caution, since Apple Mail Privacy Protection and similar privacy features can register an open even when nobody reads the message, so clicks are the more reliable signal.

Conversion and list metrics show whether email is paying off. Track conversion rate, revenue per email, list growth, and unsubscribe rate. Then compare every number against your own history and against current industry benchmarks, because a single figure in isolation says little about whether it is good or bad.

Use these reference points as a starting place. Industry averages vary a lot by sector and list size, so treat them as a sanity check, not a target. Your own trend over time matters more. Mailchimp publishes averages by industry on its email marketing benchmarks page.

Metric

Reference point

Source

Spam complaint rate

Below 0.1%, and never 0.3% or higher

Google sender guidelines

Unsubscribe rate

0.22% average

Mailchimp benchmarks, all users, data as of December 2023

Click rate

2.62% average

Mailchimp benchmarks, all users, data as of December 2023

Open rate

35.63% average, inflated by privacy features

Mailchimp benchmarks, all users, data as of December 2023

Bounce rate

No fixed number. A sudden rise is a warning sign, often from an old or imported list

Your own history

How to do an email marketing audit, step by step

The order matters. Some problems, such as poor deliverability, distort every other number, so you want to rule them out first. Follow these steps and record each finding as you go:

1. Set your goal and time period. Decide what you want to learn and which months of data you will review.
2. Gather your data. Pull campaign, automation, and list data from your email platform, plus conversion data from your web analytics.
3. Check deliverability and setup. Review bounces, complaints, and authentication before anything else.
4. Review list health. Look at growth, sign-up sources, and how many subscribers have stopped engaging.
5. Analyze performance. Compare campaigns and automations against your history and against benchmarks.
6. Review content and design. Check subject lines, copy, calls to action, and mobile rendering.
7. Document everything in one place. A shared sheet or report keeps findings from getting lost.

A simple spreadsheet or checklist is enough to keep this organized. Whichever format you use, keep the steps and time periods consistent. That way, your next audit can be compared directly with this one.

Email marketing audit checklist

Use this checklist to record what you find. Mark each line as fine, needs work, or urgent.

Area

What to check

Warning sign

Authentication

SPF, DKIM, and DMARC records are set up and passing

No DMARC record, or authentication failures in Google Postmaster Tools

Bounces

Hard and soft bounces over time

A sudden rise after an import or a long gap between sends

Spam complaints

Complaint rate for each campaign

Anything close to 0.1%

List health

Subscribers who have not engaged within your inactivity window

The inactive share grows month after month

Sign-up sources

Where new subscribers come from

One source with more bounces or complaints than the rest

Campaign performance

Clicks, click-to-open rate, conversions, and revenue per email

A steady decline across several months

Automations

Welcome, abandoned cart, and re-engagement flows

A flow with no sends in the last 30 days

Content and design

Subject lines, preview text, calls to action, mobile display, and accessibility

Low click-to-open rate, broken links, or images without alt text

Compliance

Consent records, one-click unsubscribe, and sender details

Unsubscribes that take more than two days to process

Example: what audit findings look like

Here is how findings look for a sample ecommerce account in an Email Audit Engine demo workspace. The audit scores the account, compares it with industry benchmarks, and ranks what to fix. The Email Performance Index gives you one number to track from one audit to the next.

[image: audit score and Email Performance Index from the demo workspace. Alt text: Email Audit Engine audit score for a sample Mailchimp account]

A ranked list of findings reads like this:

1. The welcome automation stopped sending after a sign-up form change. High impact, low effort, so fix it this week.
2. Spam complaints rose after a list import. Pause sends to the imported contacts and check how they opted in.
3. The monthly newsletter's click rate is below the industry benchmark. Test one clear call to action against the current layout.

Each finding names the problem, how much it matters, and the next step. Hold any audit to that standard, whether a tool or a person runs it.

How do you turn findings into fixes?

An audit that ends in a long list of problems can feel overwhelming. The fix is to sort every finding by impact and effort. High-impact, low-effort items go first, and anything that blocks deliverability jumps to the top regardless of effort.

Next, split the list into quick wins and longer projects. A broken unsubscribe link or a missing DKIM record can be fixed this week. A full redesign of your welcome series may take a month, so give it an owner and a date.

Before you change anything, write down your baseline numbers. Then test changes one at a time, ideally with A/B tests, so you know which fix made the difference. A simple before-and-after summary makes this easier, because stakeholders can see what changed without digging through raw data.

A few tests worth running after an audit:

• Subject line: a plain description of the offer against a question.
• Call to action: one button against two, or the same button with clearer wording.
• Send time: your usual slot against the time your most engaged subscribers tend to click.

Mailchimp's built-in A/B tests cover the subject line, from name, content, and send time, so you can run all three without another tool.

A 30/60/90-day plan

For a larger program, put the fixes on a timeline:

• First 30 days: fix deliverability and authentication, set list hygiene rules, repair broken automations, and clean up tracking.
• Days 31 to 60: improve segmentation, rework the weakest automations, and test content and design changes.
• Days 61 to 90: settle on a testing rhythm, tighten reporting, and record the baseline for your next audit.

How often should you run an email marketing audit?

There is no single rule, because the right rhythm depends on how often you send and how big your list is. Many teams run a full audit once or twice a year and pair it with lighter monthly checks of their core metrics. Higher-volume senders often audit more frequently.

Some moments call for an audit regardless of the calendar. A sudden drop in results, a change of sending domain or platform, a large list import, or the run-up to a busy sales season are all good triggers. Catching a problem before peak season is far cheaper than fixing it during one.

Repeating the same audit over time also gives you something valuable: proof of progress. When you measure the same things the same way, you can show exactly how your program has improved. That only works if the findings lead to action, so treat every audit as the start of a to-do list rather than the end of a project.

What does an email marketing audit cost?

It depends on who does the work. There are three common routes:

• Do it yourself: no fee, but it takes time. Pulling, cleaning, and comparing data in spreadsheets is the slow part.
• Use a tool: Email Audit Engine has a free plan for one Mailchimp account, with no card needed. Paid plans start at $35 a month, or $20 a month billed annually.
• Hire an agency or consultant: you get a person's judgment and often help with the fixes. Prices depend on scope. As one example, SendFocus lists a one-time written audit at $1,500.

Many teams split it. A tool handles the data, and people make the decisions.

Running email marketing audits for clients

If you are an agency or a freelance consultant, an audit does two jobs. It shows clients what you found, and it shows prospects what you could fix for them.

For client reporting, turn the audit into a report clients will read. Email Audit Engine exports reports as a PDF or a share link. On Premium, every report, dashboard, and form carries your logo and colors instead of ours, and the price is flat: $60 a month, or $36 a month billed annually, for unlimited client workspaces.

For new business, put the audit on your own website. Every plan includes the embeddable audit form, so a prospect can connect their Mailchimp account and get an audit before your first call. Premium adds white-label forms and lead generation. See white-label email audits for agencies for how it works.

What an audit tool can and cannot check

A tool speeds up the data work, but no single tool sees everything. Here is what Email Audit Engine covers and where to look for the rest:

Check

Email Audit Engine

Where else to look

Campaign and automation performance

Yes, from your Mailchimp data

Mailchimp reports, compared by hand

List growth and subscriber engagement

Yes

Mailchimp audience reports

Bounces, complaints, and unsubscribes

Yes, as reported by Mailchimp

Mailchimp campaign reports

Comparison with industry benchmarks

Yes, plus an Email Performance Index score

Published benchmark reports

SPF, DKIM, and DMARC records

No

Your domain's DNS settings, or a DNS checker such as MXToolbox

Domain reputation

No

Google Postmaster Tools

Inbox placement

No

A seed-list inbox placement test

Display across email clients

No

Mailchimp's preview and test tools

Frequently asked questions

What is an email marketing audit?

An email marketing audit is a structured review of your whole email program. It checks your data, setup, list, campaigns, content, and automations. The result is a prioritized list of what to fix and why.

What should an email marketing audit include?

A complete audit covers deliverability, list health, campaign and automation performance, content, segmentation, and compliance. Deliverability usually comes first because it affects every other result. Each area should end with specific findings, not general observations.

How long does an audit take?

Pulling the data takes minutes with a tool and several hours by hand. Reviewing it and agreeing on fixes usually takes a few hours for a small program with a handful of automations, and several days for a large, multi-brand one.

How much does an email marketing audit cost?

Doing it yourself costs only time. Email Audit Engine has a free plan for one Mailchimp account, and paid plans start at $35 a month. Agencies set fees by scope; one published example is a one-time written audit for $1,500.

How often should you audit your email marketing?

Many teams run a full audit once or twice a year, with lighter monthly checks in between. You should also audit after a sudden drop in results or a major change, such as a new sending domain. The right frequency depends on your send volume and goals.

How is an email marketing audit different from a deliverability check?

A deliverability check looks only at whether your emails reach the inbox. A full email marketing audit includes deliverability but also reviews your list, content, performance, and automations. A deliverability check is one part of the full audit, not a replacement for it.

Which metrics matter most in an audit?

Start with bounce rate and spam complaint rate, since they affect whether your emails arrive at all. Then look at clicks, click-to-open rate, conversions, and revenue per email. Open rate is useful context, but privacy features can inflate it.

Can you audit your email marketing yourself?

Yes, as long as you have access to your email platform data and a clear checklist. The main challenge is time, because pulling and comparing data by hand is slow. An audit tool can speed up the data work so you can focus on decisions.

What should you fix first after an audit?

Fix anything that stops your emails from being delivered, such as authentication errors or high bounce rates. Then move to high-impact, low-effort improvements. Leave bigger projects for later, with an owner and a deadline attached.

Run your first email marketing audit

Every email program drifts over time. Lists age, automations go stale, and small setup errors quietly cost you inbox placement. An email marketing audit brings all of that into view, and working through it in the right order, with deliverability first, keeps the effort focused on what moves results.

The review itself is only half the job. The value comes from sorting findings by impact, fixing the blockers first, and testing changes one at a time. Repeat the same checks on a steady schedule, and you build a record that proves what improved.

If your campaigns run through Mailchimp, Email Audit Engine can take much of the data gathering off your plate.

It runs a free email marketing audit on your existing campaign data in minutes, which gives you a clear starting point for your first round of fixes. From there, the steps in this guide tell you what to do with what it finds.

Audit your Mailchimp account in minutes. Free.