What is Newsletter Glue plugin?
Newsletter Glue is a WordPress plugin that lets you build and send email newsletters directly from the WordPress post editor — using Gutenberg blocks to design emails without switching to a separate email platform’s interface. Instead of designing newsletters in Mailchimp, Beehiiv, or ConvertKit’s proprietary editors, Newsletter Glue brings email creation into the WordPress workflow, where content teams already work.
The plugin connects to email service providers (Mailchimp, Sendinblue/Brevo, MailerLite, ConvertKit, and others) and adds an email-specific panel to the Gutenberg editor. When you publish a post, Newsletter Glue can optionally also send it as a newsletter to your email list — the post becomes simultaneously a web page and an email. Alternatively, you can design standalone newsletter-only content that is sent without being published as a post.
Newsletter Glue is particularly valuable for content creators and publications that use WordPress as their CMS and want to build a newsletter operation without managing a separate email-first platform. The integration with Beehiiv (the newsletter platform) is a notable feature for creators who want Beehiiv’s audience-building tools with WordPress-based content creation. Pricing starts at $59/year for a single site connection.
Need Help With Newsletter Glue Setup, Troubleshooting, or Customization?
Need help with Newsletter Glue? Whether you are dealing with errors, broken functionality, styling problems, plugin conflicts, or advanced customization, we can help you fix the issue and get the plugin working properly on your WordPress site.
Get Newsletter Glue Expert HelpKey Features
- Build email newsletters in the Gutenberg block editor
- Email service provider integrations: Mailchimp, Brevo/Sendinblue, MailerLite, ConvertKit, Beehiiv, and others
- Send posts directly as newsletters — publish once, send as email
- Send newsletters separately from blog posts
- Email-specific blocks: header, footer, featured image, custom content blocks
Pros & Cons
Pros
- Removes context-switching between WordPress and email platform — write once, publish everywhere
- Gutenberg-based design works with team members already familiar with the block editor
- Post-as-newsletter workflow is ideal for content-first publishers
Cons
- Requires a separate email service provider subscription (Newsletter Glue connects but does not host lists)
- Limited advanced email marketing features (automation, behavioral segmentation) that dedicated ESPs provide
Free vs Premium
Free trial available. Pro starts at $59/year (1 site connection). Higher tiers for multiple sites or ESP connections.
Common Problems & Fixes
Newsletter Glue is not connecting to Mailchimp — the API connection setup fails with an authentication error. How do I fix the Mailchimp connection?
Go to Newsletter Glue → Settings → Integrations → Mailchimp. Verify the Mailchimp API key is correctly entered — obtain a fresh API key from Mailchimp → Account → Extras → API Keys. Ensure the API key has not expired or been revoked. Also verify your server can make outbound HTTPS requests to api.mailchimp.com (some hosting firewalls block external API calls). If the connection still fails, check if your Mailchimp account’s server prefix matches — Mailchimp API keys end in -us1, -us2, etc. indicating the API server.
A newsletter sent via Newsletter Glue is rendering incorrectly in email clients — images are not displaying or layout is broken in Outlook. How do I fix email rendering?
Email clients (especially Outlook) use limited HTML/CSS support. Newsletter Glue outputs email-safe HTML, but custom blocks or themes may introduce CSS that email clients cannot render. Test newsletters using an email testing tool (Litmus, Email on Acid, or Mailchimp’s Inbox Preview) before sending. Common issues: (1) background images not supported in Outlook — use solid colors instead; (2) web fonts not rendering — ensure fallback fonts are specified; (3) padding/margin from custom blocks — inspect the email source HTML for problematic CSS.
Newsletter Glue is showing the newsletter as sent in WordPress but subscribers have not received it. How do I verify delivery?
Newsletter Glue sends the campaign through your ESP (Mailchimp, etc.) — it triggers the send but delivery happens on the ESP’s side. Check: (1) in Mailchimp (or your ESP), verify the campaign was created and sent — look in Campaigns for the newsletter; (2) check the campaign’s delivery statistics in your ESP dashboard for delivery rates and any errors; (3) verify the selected list has active subscribers — a list with zero active subscribers results in a send with no deliveries; (4) check your ESP account for sending limits or paused account status.
Customization & Developer Notes
How do I use Newsletter Glue to send a blog post directly as a newsletter to my Mailchimp list?
In the Gutenberg editor while writing or editing a post, look for the Newsletter Glue panel in the right sidebar. Enable “Send as Newsletter” and configure: (1) select the Mailchimp list or segment to send to; (2) configure the email subject line (defaults to post title); (3) choose whether to send immediately on post publish or schedule for a specific time; (4) optionally customize which blocks appear in the email version vs. web version. When you publish the post, Newsletter Glue automatically creates and sends the Mailchimp campaign.
How do I create a newsletter-only post in Newsletter Glue that is not published on the website?
Create a new post in WordPress. In the Newsletter Glue panel, enable “Newsletter Only” mode — this sends the content as an email but does not publish the post publicly on the website. The post remains as a draft or private in WordPress while the newsletter is sent. Alternatively, publish the post with a “Private” visibility setting — the email is sent to subscribers but the web version is not publicly accessible.
Frequently Asked Questions
Is Newsletter Glue better than Mailchimp for creating newsletters?
Newsletter Glue is not an alternative to Mailchimp — it is a WordPress interface for using Mailchimp (or another ESP) without leaving WordPress. Newsletter Glue uses Mailchimp for list management, delivery, and analytics. The benefit is creating newsletter content in the WordPress editor rather than Mailchimp’s proprietary editor. For teams already comfortable with Gutenberg who publish regularly on WordPress, Newsletter Glue removes the context-switching overhead. For email-first marketers who primarily work in Mailchimp, Newsletter Glue adds complexity without proportional benefit.
What email service providers does Newsletter Glue support?
Newsletter Glue supports Mailchimp, Brevo (Sendinblue), MailerLite, ConvertKit, Beehiiv, ActiveCampaign, and several others. The supported ESP list continues to grow. Check the Newsletter Glue website for the current integration list, as new providers are added regularly. Each integration requires a valid API key from the connected ESP.
Can Newsletter Glue break after updates?
Yes, that can happen, especially on older sites with many plugins. This usually happens when the plugin, theme, and add-ons are updated out of sequence. In most cases, testing on staging catches the issue before it reaches the live site. From experience, backups and changelog reviews save a lot of cleanup time.
What should I check before installing Newsletter Glue?
Start by checking whether another plugin already does the same job. In most cases, overlap is what creates avoidable conflicts and performance issues. A common issue is installing a plugin because it looks convenient without checking the stack first. From experience, a short compatibility review avoids most of the pain later.