How Important Is Email Marketing for Your Site?

Email is still the one marketing channel you own outright. Social reach is rented, ad costs keep climbing, and search traffic swings with every algorithm update, but a list of people who asked to hear from you keeps working year after year. For most WordPress businesses we work with, email is the channel that pays the bills, and it deserves more than an afterthought newsletter.

This guide covers what email actually delivers today, the numbers worth trusting, the deliverability rules that changed in 2024 and 2025, and a practical setup for a WordPress site that wants email to carry real revenue.

What email still does better than any other channel

Three things make email different from social, paid, and search, and none of them have changed in twenty years.

You own the list. If your Instagram account gets suspended or Meta halves organic reach again, you lose the audience you built there. Your email list is a CSV you can export and move to another provider this afternoon. Nobody can take it away.

It reaches people who already said yes. A subscriber opted in. That is a different relationship from a stranger scrolling past an ad. Conversion rates reflect it: across the benchmark reports we track, email converts at two to three times the rate of social traffic for the same offer.

It is cheap to scale. Sending to 50,000 people costs roughly the same effort as sending to 500. Most providers price by list size and the per-send cost falls toward zero. Paid channels do the opposite, with every extra click costing real money.

The numbers worth trusting (and the ones to ignore)

Email statistics get copied from blog to blog until nobody remembers where they came from. Here are the figures we are comfortable citing, with their sources.

Metric	Figure	Source and notes
Return on spend	$36 per $1 is the commonly quoted average; 35% of marketers report $10 to $36, 30% report $36 to $50	Litmus State of Email survey, 2025. Treat it as a range, not a promise.
Average open rate	30% to 43% depending on dataset	MailerLite, Klaviyo and Dotdigital 2025 to 2026 benchmarks. Inflated by Apple Mail Privacy Protection.
Average click rate	1.4% to 2.5%	Dotdigital and MailerLite 2026 benchmarks. The most reliable engagement metric you have.
Click-to-open rate	Around 6.8%, falling year over year	MailerLite 2026. Falling partly because opens are inflated.

The old “$42 for every $1” figure you still see everywhere comes from a 2019 DMA report. It was real at the time, but quoting it in 2026 as current data is sloppy. Use the Litmus range.

One more warning: open rate is no longer a clean metric. Since Apple introduced Mail Privacy Protection in 2021, Apple Mail pre-loads images for a large share of users, which registers as an open whether the person read the email or not. Apple Mail accounts for close to half of all recorded opens. Judge campaigns by clicks, replies and revenue, and use opens only for rough list-health trends.

The deliverability rules that changed everything

If your emails have quietly started landing in spam, this is probably why. In February 2024, Gmail and Yahoo began enforcing requirements for anyone sending more than 5,000 messages a day to their users, and Microsoft followed with equivalent rules for Outlook.com in May 2025. The requirements are now the baseline for every serious sender, regardless of volume:

1. SPF and DKIM authentication on your sending domain. SPF lists who may send on your behalf; DKIM cryptographically signs each message.
2. A DMARC policy published in DNS, at minimum v=DMARC1; p=none;, with the From domain aligned to the SPF or DKIM domain.
3. One-click unsubscribe using the List-Unsubscribe and List-Unsubscribe-Post headers, with the request honoured within two days.
4. Spam complaint rate kept under 0.3% as measured in Google Postmaster Tools, with 0.1% as the realistic target.

Any reputable email provider (Mailchimp, Brevo, MailerLite, Klaviyo, ActiveCampaign) handles the headers and DKIM signing for you, but you still have to add the DNS records they give you. Check your domain at MXToolbox or Google’s own checker before blaming your provider for poor inbox placement.

For WordPress sites there is a second trap. Transactional email (password resets, order receipts, course enrolment confirmations) goes out through PHP mail by default, which most hosts send from a shared IP with no authentication. Install an SMTP plugin such as WP Mail SMTP or FluentSMTP, route through a transactional service (Postmark, SendGrid, Amazon SES, Brevo), and authenticate that domain too. We have seen “customers never get their receipts” tickets resolved by this single change more times than we can count.

Where email fits in a WordPress business

The abstract case for email matters less than what it does for the kind of sites our readers run. Here is how it plays out for each.

WooCommerce stores

Abandoned cart recovery, post-purchase follow-ups and win-back campaigns are the three automations that pay for the tooling. Cart recovery alone typically claws back 5% to 10% of abandoned revenue. We covered the setup in detail in our guide to automating email marketing for WooCommerce, including which triggers to build first.

Course and membership sites

For LearnDash, LifterLMS or Tutor LMS sites, email drives completion rates. A learner who gets a nudge at day three and day seven is far more likely to finish, and finishers renew and refer. Drip sequences tied to enrolment and inactivity are the highest-value automations, ahead of any promotional campaign.

Community sites

Communities die from silence. A weekly digest of the best discussions, new members and upcoming events brings people back who would otherwise forget the site exists. BuddyPress and BuddyNext sites can send digest notifications natively, and pairing those with a monthly editorial email from the site owner keeps the relationship personal.

Agencies and service businesses

Lead nurture. Most prospects are not ready to buy when they first download your checklist or request a quote. A six-email sequence over a month that explains how you work, shows results and answers objections does the selling while you do the work.

A setup that works for most WordPress sites

You do not need an enterprise platform. This is the stack we put in place for a typical small to mid-size WordPress business.

1. Pick one provider for marketing email. MailerLite and Brevo have generous free tiers and good WordPress integration. Klaviyo is worth the cost for WooCommerce stores above roughly $10,000 a month in sales because its product and order data integration is deeper. FluentCRM and Groundhogg run inside WordPress itself, which keeps data on your server and avoids per-contact pricing, at the cost of sending through your own SMTP service.
2. Separate transactional from marketing. Route WordPress system email through an SMTP plugin and a transactional service. Keep marketing on the marketing platform. Mixing them means a bad campaign can hurt delivery of password resets.
3. Authenticate both domains. SPF, DKIM and DMARC for whatever sends on your behalf. Budget 30 minutes and a DNS login.
4. Build three automations before any newsletter. A welcome sequence (three emails), an abandoned cart or abandoned enrolment reminder, and a re-engagement email at 90 days of inactivity. These run forever and outperform one-off sends.
5. Add the newsletter last. Once the automations exist, a regular send (weekly or fortnightly, pick one and stick to it) keeps the list warm.

Growing the list without buying trouble

Never buy or scrape a list. Purchased lists produce spam complaints that tank your domain reputation, and under GDPR, CAN-SPAM and similar laws you need demonstrable consent. Every address should come from someone who typed it in and knew what they were signing up for.

What does work: a specific lead magnet tied to your product (a template, a checklist, a short course) rather than a generic “subscribe for updates” box; a checkout opt-in for WooCommerce; an opt-in step in your community registration flow; and a short exit-intent form on your highest-traffic blog posts. Double opt-in costs you some signups but gives you a cleaner list and a defensible consent record, and we recommend it for any site sending to EU residents.

Prune, too. Subscribers who have not clicked anything in six months are hurting your engagement metrics and, through them, your inbox placement. Send a re-engagement email, then remove anyone who does not respond. A smaller list that opens and clicks beats a big one that ignores you.

Measuring what matters

Set up these four numbers and review them monthly:

• Click rate per campaign, trended over time. Your real engagement metric.
• Revenue per email sent for stores and course sites, pulled from WooCommerce or your LMS order data with UTM-tagged links.
• List growth rate net of unsubscribes and pruning.
• Spam complaint rate in Google Postmaster Tools. Above 0.1% means something in your content or consent process needs fixing.

Tag every link with UTM parameters so Google Analytics attributes the visit to the campaign. Without that, email looks like “direct” traffic and you will undervalue it.

Frequently asked questions

Is email marketing still effective with all the spam filtering?

Yes, if you authenticate properly and send to people who opted in. The filters mainly punish senders who skipped those steps. Well-run lists in 2026 still see click rates of 2% to 5% and measurable revenue.

How often should we send?

Consistency matters more than frequency. Weekly is a good default for content-led businesses; stores can go two or three times a week during promotions if the content is relevant. Watch unsubscribes and complaints, and back off when they rise.

Should we use an in-WordPress CRM or an external platform?

In-WordPress tools like FluentCRM give you data ownership and no per-contact fees, but you are responsible for sending infrastructure and deliverability. External platforms handle that for you. For lists under 10,000 contacts and a team with some technical comfort, in-WordPress works well. For larger lists or non-technical teams, an external platform is the safer choice.

Does AI-written email perform worse?

Generic AI copy performs badly because it sounds like everyone else. Using AI to draft and then rewriting in your own voice, with specific details about your product and customers, performs fine. Subscribers respond to specificity, not polish.

Where to start

If you do nothing else this week, check your domain’s SPF, DKIM and DMARC records and install an SMTP plugin for WordPress system email. That fixes the silent delivery problems most sites have. Then build a three-email welcome sequence. You will have a working email programme before you ever write a newsletter, and it will keep paying long after this month’s social posts have scrolled away.