Email Marketing

A basic email operation can start with US$0 in email-platform fees because several major providers offer free plans. Paid costs appear as the list grows or advanced automation, segmentation, analytics, and ecommerce features are required.

Email can produce direct revenue through product sales, subscriptions, affiliate commissions, sponsorships, and service leads. It can also create business value through repeat purchases, onboarding, abandoned-cart recovery, retention, and customer reactivation.

Litmus surveyed nearly 500 marketing professionals for its 2025 State of Email research. Among respondents:

• 35% reported receiving US$10–36 for every US$1 spent on email marketing.

• 30% reported US$36–50 per US$1 spent.

• 5% reported more than US$50 per US$1 spent.

• 21% did not measure email ROI.

These figures describe surveyed marketing organizations, not expected returns for a new list. Reported ROI can change substantially depending on whether subscriber acquisition, labor, discounts, software, and gross margin are included.

Only one email platform is normally required.

beehiiv Launch supports up to 2,500 subscribers with unlimited email sends.

Kit Free supports up to 10,000 subscribers, unlimited landing pages and forms, and unlimited email broadcasts.

Mailchimp Free supports up to 250 contacts and 500 email sends per month, with a daily send limit of 250.

Klaviyo Free supports up to 250 active profiles and 500 email sends per month.

Kit Creator adds unlimited visual automations and email sequences.

beehiiv Scale adds email automations, its Ad Network, paid subscription features, digital products, surveys, and advanced analytics.

Marketing Automation becomes more important as a list grows because triggered workflows can run continuously instead of requiring every message to be sent manually.

1. Choose an email platform that fits the business model.

2. Create subscription forms or landing pages.

3. Acquire subscribers through existing customers, website traffic, content, social media, lead magnets, or paid acquisition.

4. Configure sender authentication and domain settings.

5. Create a welcome sequence or another high-value automation.

6. Send campaigns or newsletters to relevant segments.

7. Track clicks, conversions, unsubscribes, complaints, and attributed revenue.

8. Compare subscriber acquisition cost with revenue or gross profit generated by the list.

A Blogging business may collect subscribers from organic traffic, while an ecommerce business may collect addresses during checkout or through promotional forms.

Affiliate Marketing, digital products, courses, and services can also be monetized through the same list.

Platform choice matters more after automations, integrations, subscriber tags, and customer data have been built around one provider because migration becomes more complicated.

Google requires senders to Gmail accounts to use SPF or DKIM authentication, TLS, valid DNS records, and properly formatted messages.

Senders delivering more than 5,000 messages per day to Gmail accounts must meet additional requirements, including:

• SPF and DKIM;

• a DMARC record;

• one-click unsubscribe for marketing and subscribed messages;

• a clearly visible unsubscribe link;

• spam rates below 0.3%.

Google recommends keeping spam rates below 0.1% and avoiding rates of 0.3% or higher.

Yahoo also requires bulk senders to use SPF, DKIM, and DMARC, support easy unsubscribe, and keep spam complaint rates below 0.3%.

Commercial email rules vary by jurisdiction.

In the United States, the CAN-SPAM Act applies to commercial email and requires, among other things:

• accurate sender and routing information;

• non-deceptive subject lines;

• a valid physical postal address;

• a clear opt-out method;

• honoring opt-out requests within 10 business days.

The law also applies to business-to-business commercial email.

In the European Union, direct marketing by email is subject to GDPR and ePrivacy rules. The ePrivacy Directive generally requires prior consent for direct marketing email, with an exception that can apply when a business obtained a customer's email during a sale and markets its own similar products or services while providing a free and easy way to object.

Businesses operating internationally may therefore need different consent and unsubscribe practices depending on where recipients are located.

• List size can be misleading. A smaller high-intent list can produce more revenue than a much larger low-intent list.

• Acquisition cost can erase strong email ROI. Subscriber acquisition, discounts, software, labor, and content costs should be included when evaluating economics.

• Deliverability can become an operating constraint. Authentication, complaint rates, and unsubscribe handling become more important at scale.

• Platform costs generally rise with list size. A free setup can become a recurring software expense as the subscriber base grows.

• Attribution can overstate incremental revenue. A customer who clicks an email before buying may have purchased anyway, so attributed email revenue is not automatically equal to additional profit.

• beehiiv — Pricing

• Kit — Pricing

• Mailchimp — About Mailchimp Pricing Plans

• Mailchimp — Marketing Pricing

• Klaviyo — Pricing

• Klaviyo Help Center — Understanding How Free and Paid Plans Differ

• Litmus — The ROI of Email Marketing

• Google Gmail Help — Email Sender Guidelines

• Google Gmail Help — Email Sender Guidelines FAQ

• Yahoo Sender Hub — Sender Best Practices

• FTC — CAN-SPAM Act: A Compliance Guide for Business

• European Commission — Legal Grounds for Processing Data

• EUR-Lex — ePrivacy Directive, Article 13