WordPress Email Marketing: Best Plugins, SMTP Setup & Newsletter Guide (2026)

WordPress doesn’t include a reliable email system out of the box. PHP mail — the default — is slow, unauthenticated, and blocked by many hosts. This guide fixes that and adds full email marketing capabilities to your WordPress site.

WordPress Email: The Problem

WordPress uses PHP’s mail() function by default. Problems:

• No authentication: No SPF/DKIM means emails go to spam
• Blocked by hosts: Many shared hosts disable PHP mail
• No tracking: Can’t see opens, clicks, or bounces
• Basic templates: Plain text transactional emails
• No marketing: Can’t send newsletters or campaigns

Fix #1: Set Up SMTP (Essential)

SMTP routes WordPress emails through a proper email server.

Option A: Brevo Plugin (Recommended)

Best for: Email marketing + SMTP in one plugin

1. Install “Brevo” plugin from WordPress repository
2. Create free Brevo account (300 emails/day)
3. Enter API key in plugin settings
4. Enable “Send emails via Brevo SMTP”
5. Test delivery

Includes: SMTP + newsletters + automation + forms + CRM

Option B: WP Mail SMTP

Best for: SMTP-only (if you already have a separate email marketing tool)

1. Install “WP Mail SMTP” from WordPress repository
2. Choose your mailer (Brevo, Gmail, SendGrid, etc.)
3. Configure authentication
4. Send test email

Fix #2: Authenticate Your Domain

Even with SMTP, you need domain authentication:

1. Add SPF record to your DNS
2. Add DKIM record
3. Set up DMARC policy

Brevo provides exact DNS records to add. See our SPF/DKIM/DMARC guide.

Best WordPress Email Plugins

For Full Email Marketing

For SMTP Only

Adding a Newsletter to WordPress

With Brevo Plugin

1. Create signup form in Brevo dashboard
2. Add to WordPress via shortcode, widget, or Gutenberg block
3. Design newsletter in Brevo’s drag-and-drop editor
4. Send to subscribers directly from Brevo
5. Track results — opens, clicks, conversions

Subscription Form Options

• Sidebar widget
• Inline within posts
• Popup/modal
• Footer signup
• Dedicated landing page

WordPress Email Automation

With Brevo’s WordPress plugin, automate:

• Welcome emails for new subscribers
• Blog post notification emails
• User registration confirmations
• Password reset emails (branded)
• Drip campaigns for lead nurturing

Troubleshooting WordPress Email

Emails Not Sending

1. ✅ Install SMTP plugin (Brevo or WP Mail SMTP)
2. ✅ Verify SMTP credentials
3. ✅ Check hosting doesn’t block port 587
4. ✅ Send test email from plugin settings

Emails Going to Spam

1. ✅ Authenticate domain (SPF + DKIM + DMARC)
2. ✅ Use consistent “From” address matching your domain
3. ✅ Don’t use a free email (gmail.com) as sender
4. ✅ Check blacklists

Slow Email Delivery

1. ✅ Switch from PHP mail to SMTP
2. ✅ Use a dedicated email service (not shared hosting SMTP)
3. ✅ Enable async sending if available

Recommended Setup

For most WordPress sites:

1. Install Brevo plugin — handles SMTP + marketing in one
2. Authenticate domain — SPF, DKIM, DMARC
3. Create signup forms — start building your list
4. Set up welcome automation — engage new subscribers
5. Send regular newsletters — stay top of mind

Get started with Brevo free →

Related Guides

• Email Deliverability Guide
• Email List Building
• Newsletter Complete Guide
• Free Newsletter Platforms