Updated
An email copywriting service earns its retainer on the sends a template library cannot write for you, so a buyer comparing email copywriting services gets further by asking what lands in the inbox each month than by reading a rate card. Mailchimp’s benchmark data from December 2023 puts the average ecommerce campaign at a 29.81% open rate and a 1.74% click rate, which means a list of 20,000 people produces about 350 clicks per send, and the writer’s job is to move that number one send at a time.
The Welcome Sequence Sets the Tone for the List
The first deliverable is a welcome sequence of three to five emails that fires when someone subscribes, because a new subscriber reads the first message at a rate no later campaign will match. Omnisend’s 2023 data puts automated welcome emails at a 42.1% open rate, a 5.4% click rate, and a 1.9% conversion rate, against a campaign average well under half of that. A service writes the sequence as a single arc rather than five separate blasts, so the first email delivers the promised offer, the second tells the founder’s reason for the product, the third points at the three best sellers, and the last asks a question that a reply can answer. The writer also sets the send timing and the exit rule, since a subscriber who buys on day two does not need the day five discount.
Promotional Sends Carry the Calendar
Promotional sends are the visible work, the launch, the sale, the restock, the holiday run, and a service plans them on a calendar four to six weeks ahead so the copy is written before the deadline instead of on it. Each send arrives as a subject line, a preheader, body copy, a button, and an alt-text line for the hero image, with two subject line variants when the platform can split the list. The writer needs the product catalog, the margin on the item being pushed, and the last three months of sends to avoid repeating an offer the list has ignored, and a good one will push back on a fourth discount email in a month because the unsubscribe rate, which Mailchimp measures at 0.22% per campaign, climbs when the list learns that the next sale is a week away. We advise clients about sending too many discounts often, and we do not do it by telling them. We share what other clients ran into when a mailing leaned on discount after discount, and the client draws the line for themselves. The buttons follow the same rules as any call to action, and the ones in our list of twenty strong CTA examples translate to email without changes.
Lifecycle and Abandon Flows Earn While the Team Sleeps
Flows are where the money sits. Klaviyo’s 2023 abandoned cart benchmark, drawn from more than 143,000 flows, puts the average abandoned cart series at $3.65 in revenue per recipient and a 3.33% conversion rate, with the top 10% of brands reaching $28.89 per recipient, and Omnisend’s figures show automations producing 37% of email-generated sales from 2% of send volume. A service writes the cart series, the browse abandonment note, the post-purchase thank-you and cross-sell, the win-back email at 60 or 90 days of silence, and the replenishment reminder timed to how long the product lasts. Each flow gets written once and then earns for a year, which is why a vendor’s flow work matters more than the campaign work. When a client tells me they are starting with the Klaviyo templates, my answer is that the templates are fine to start, and the flows get added to over time, because doing the small version is better than not doing it at all.
The Newsletter Keeps the List Warm Between Offers
A newsletter is the send with no offer in it, and a service writes it so the list opens a message from the brand when there is nothing to buy, because a list that hears from you during sales alone learns to wait for the sale. The deliverable is a recurring issue, weekly or biweekly, built from a customer story, a product how-to, a founder’s note, or the month’s best blog post, written to a length that survives the phone screen. The writer picks the one item that leads and cuts the rest to a line each, and the metric I judge a newsletter on is the reply rate. Click-through is not one of the important numbers on a newsletter anymore, reply rate is one of the most important, since a newsletter that gets replies keeps the sender reputation that the promotional sends spend.
Subject Line Testing Is Where Email Copywriting Services Prove Their Worth
Subject line testing is the one place where the copy gets a score, and a template has no way in. A service ships two or three subject lines per send, runs the split on a slice of the list, and reads the result before the winner goes to the rest, and Omnisend’s survey found personalized subject lines lift open rates by 10% to 14% across industries. The catch is that opens stopped being a clean number when Apple Mail Privacy Protection began preloading images, a caveat Mailchimp prints on its own benchmark page, so a working service tests on clicks and revenue per recipient rather than opens, and keeps a log of which angles won, the number, the question, the plain statement, the name in the subject, so the following sends start from what the list has answered.
The Reporting Loop Closes the Month
Buyers forget to ask for the reporting loop, and the retainer earns its keep or loses it on that page. HubSpot’s email statistics roundup finds 44% of marketers analyze performance weekly and 21% of marketing leaders do not measure email ROI, which leaves a lot of programs sending on faith. Litmus’s 2025 figures put 35% of marketing leaders at $10 to $36 back per dollar spent on email and another 30% at $36 to $50, and a program knows which bucket it sits in when someone writes the number down each month. A service delivers a one-page monthly read with revenue per send, click rate by segment, the flow revenue on its own line, the test results, and the three changes for the following month, and the writer reads that page before writing the next send. The first line I look at on that page is the conversion from the click-through, and the line after it is the reply rate.
Where a Human Writer Differs From a Template Tool
A template tool gives you the structure of a welcome sequence in five minutes. The tool does not know the product’s margin, the customer who wrote in about the broken zipper, or the reason the founder started the company. Readers can tell when a machine wrote it, and email is the format where the tell costs the most, since the message sits in the same inbox as a note from a friend. Content Cucumber runs a human writer on each account with an AI-assisted workflow behind the writer for research and first-pass drafts, and a human reads each send before it goes out, which lets the writer spend the hours on the subject line and the flow logic instead of on the formatting.
What to Ask a Vendor Before Signing
The earlier Content Cucumber read on email copywriting services covers the five questions about who writes, who edits, and who defends the words, and the contract questions matter as much. Ask who owns the flow copy and the test log if you leave, whether the flows get built in your platform or handed over as a document, how many revision rounds a send gets and at what turnaround, whether the writer sees your revenue data or your open rates alone, and whether the price on the proposal covers the flows or the calendar sends alone. My answer on the first one is settled, the vendor owns the flow copy and the test log, and the vendor is responsible for handing both to the client. Ask where the writer sits, too, because a rate that looks like four cents a word tends to mean offshored writing with rework you pay for later. Content Cucumber’s pricing page publishes the retainer tiers so that answer is on the table before the call.
Content Cucumber’s email audit pulls your last 90 days of email and SMS sends and returns three findings with a written summary the same day, and the 15-minute version is free.
Explore our writing services
Content Services →Keep Reading
Frequently Asked Questions
A working email copywriting service ships a welcome sequence, promotional sends planned on a calendar four to six weeks ahead, lifecycle and abandon flows, a recurring newsletter, two or three subject line variants per send with a test log, and a one-page monthly report with revenue per send, click rate by segment, flow revenue, and the changes for the following month.
Omnisend's 2023 data puts automated welcome emails at a 42.1% open rate, a 5.4% click rate, and a 1.9% conversion rate, while Mailchimp's December 2023 benchmark puts the average ecommerce campaign at a 29.81% open rate and a 1.74% click rate.
Klaviyo's 2023 abandoned cart benchmark, drawn from more than 143,000 flows, puts the average abandoned cart series at $3.65 in revenue per recipient with a 3.33% conversion rate, and the top 10% of brands reach $28.89 per recipient.
Apple Mail Privacy Protection preloads images, which inflates open counts, a caveat Mailchimp prints on its own benchmark page, so a service that wants a clean score tests subject lines on clicks and revenue per recipient and keeps a log of which angles won.
Ask who owns the flow copy and the test log if you leave, whether flows get built in your platform or handed over as a document, how many revision rounds a send gets and at what turnaround, whether the writer sees revenue data or open rates alone, whether the proposal price covers flows or calendar sends alone, and where the writer sits.
This is a very practical breakdown of what an email copywriting retainer should actually include. I especially liked the focus on lifecycle flows and the monthly reporting loop, because many businesses look only at open rates and ignore revenue per recipient, replies, and post-click conversions. The point about testing subject lines against clicks and revenue instead of relying only on opens is also important with Apple Mail Privacy Protection affecting open data. A clear handover of the flow copy and test history is another detail clients should ask about before signing.