Email Marketing: What It Is and How to Do It Well
Email marketing is sending planned messages to people who have agreed to hear from you, to build a relationship, move leads toward a sale and keep customers coming back. It covers newsletters, welcome series, nurture sequences, product updates, offers and re-engagement emails. Unlike social or search, you own the list: no algorithm decides whether your subscribers see you. That’s why email marketing remains one of the steadiest channels in B2B.
Key takeaways
- Permission comes first. A smaller list of people who asked to hear from you beats a large bought list every time.
- Deliverability is now a hard requirement: authenticate your domain, keep complaints low and make unsubscribing easy.
- Judge emails on clicks, replies and pipeline. Open rates are inflated by privacy features.
Why email marketing matters
Email reaches people you’ve already earned. It nurtures the large share of buyers who aren’t ready yet, and it turns one-time customers into repeat ones. It also personalizes well: in the Content Marketing Institute’s 2026 research, 89% of B2B marketers said their organization personalizes content, and 85% of those use personalized email (CMI and MarketingProfs, 2025).
The sender rules you must meet
Gmail has enforced stricter rules for bulk senders since 2024, and its current guidelines are clear:
- 5,000+ messages a day to Gmail accounts makes you a bulk sender Google Workspace Admin Help, 2026
- 0.30% spam rate you must stay below (Google advises under 0.10%) Google Workspace Admin Help, 2026
Bulk senders must authenticate with SPF, DKIM and DMARC, and marketing emails must support one-click unsubscribe plus a visible unsubscribe link. Even if you send less, these are good practice. Our email deliverability checklist walks through each one.
Myth vs fact
- MythA high open rate means the email worked.
- FactApple's Mail Privacy Protection downloads remote content in the background when a message arrives, which can register as an "open" (Apple). Clicks, replies and conversions are more reliable.
An example from our work
If a client has no email set up, I don't start with a newsletter. I start with the emails people already expect: a welcome message after signup, a follow-up after someone downloads a guide, and a confirmation after they book a call. Those go to people who just raised their hand. Once they work and the domain is authenticated, a regular newsletter has something solid to build on.
Which emails to set up first
| Trigger | Goal | |
|---|---|---|
| Welcome series | New subscriber or lead | Set expectations, deliver what they signed up for |
| Lead nurture | Download, webinar or tool use | Move from interest to a sales conversation |
| Newsletter | Fixed schedule | Stay top of mind with useful ideas |
| Post-purchase or onboarding | New customer | Faster value, fewer cancellations |
| Re-engagement | No clicks in 90 to 180 days | Win back or remove inactive contacts |
Most of these run automatically once set up. See marketing automation for how.
How to start email marketing
Six steps to a healthy program
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Choose a platform
Look for automation, segmentation, CRM sync, and support for authentication and one-click unsubscribe.
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Authenticate your domain
Set SPF, DKIM and DMARC before your first send. Send from your own domain, not a free mailbox.
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Grow the list with consent
Use forms, lead magnets and events. Unticked consent boxes. Never buy lists.
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Build the welcome series
Three to five emails that deliver value and introduce what you do.
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Write for one reader
One idea, one call to action. Test subject lines with our subject line analyzer.
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Clean and measure monthly
Remove hard bounces and long-inactive contacts. Track clicks, replies and pipeline.
For planning individual sends, see email marketing campaign.
Frequently asked questions
What is a good click rate for email marketing?
It varies by industry and list. Instead of chasing a benchmark, compare against your own last six months and look for steady improvement, especially in clicks from your target accounts.
How often should I send marketing emails?
Often enough to stay useful, rarely enough that people don't complain. For most B2B newsletters that's every two to four weeks, plus automated sequences.
Is email marketing legal without consent?
Rules differ by country. The EU and UK generally require consent for marketing email to individuals. The US CAN-SPAM Act requires an opt-out and honest headers. Consent is the safest standard everywhere.
Is email marketing still effective in 2026?
Yes. It's one of the few channels you fully own, and it works best paired with search, content and automation.