Features and improvements we have shipped, newest first. Plunk is open source, so the full commit history is on GitHub.
3 updates
Analytics splits into overview, deliverability, engagement, and audience tabs. Filter by period or by transactional email, campaigns, or workflows, and see every rate next to the period before.
Last 30 days
CampaignsThe SMTP relay on self-hosted instances picks up renewed TLS certificates within a minute, without restarting the container.
Your agent can create workflows with every step type, connect branches, and check a workflow for errors. It asks you to confirm before enabling one that sends email.
8 updates
Contacts can pause your emails for 2 weeks, 1 month, 6 months, or 1 year instead of leaving for good. Plunk resubscribes them automatically when the snooze ends.
Read the docs: Snooze instead of unsubscribingPause emails for
Emails resume on October 11, 2026
Self-hosted instances can store uploads under a folder in the S3 bucket, and Plunk only makes that folder publicly readable.
Plunk sends a plain text version alongside the HTML of every email, generated from your content. Spam filters score HTML-only messages more harshly, so this lifts deliverability without any change to your code.
Click a campaign's bounce, spam report, or unsubscribe count to see the contacts behind it. A contact who unsubscribes twice from the same email counts once.
Emails to the Amazon SES mailbox simulator trigger events, workflows, and webhooks like any other, but never count toward your bounce and complaint rates.
Unsubscribe and preference pages are now available in Welsh.
Delete your account from the account page once you have left or deleted every project.
Hide campaigns and drafts you no longer need from the campaign list. Their stats are kept, and you can restore them.
8 updates
Connect Claude, Cursor, or any MCP client to your project. Your agent can manage contacts, draft campaigns, and send email, and it asks you to confirm before sending a campaign.
Explore the feature: MCP server
claude mcp add plunk -- npx -y @plunk/mcpSend this campaign to 2,431 people?
The editor flags Liquid syntax errors as you type, highlights logic tags, and inserts ready-made if, case, and for blocks from a menu.
Read the docs: Liquid-aware template editorHi {{ contact.firstName | upcse }}Cancelling a campaign drops its unsent emails and turns it back into an editable draft.
Plunk tracks an event whenever a contact subscribes or unsubscribes, so workflows can trigger on it.
Turn on rate limits, with burst allowances, for the track, send, and contact endpoints.
Marketing emails include the RFC 8058 headers, so the unsubscribe button built into inboxes works without opening a page.
Add a step between two existing steps, or disconnect and reconnect branches, without rebuilding the workflow.
Unsubscribe and preference pages are now available in Swedish.
4 updates
Subjects and bodies render with LiquidJS, so templates get conditionals, loops, filters, and fallback values on top of plain variables.
Read the docs: Liquid templatingHi Ana, your order is on its way
Marketing, transactional, and headless emails each get only the standard headers their type calls for.
Retry requests safely. A key reused within 24 hours is rejected, so the same email or event is never sent twice.
Plunk deletes rendered email bodies after 90 days. Stats and activity are kept.
3 updates
Contacts, templates, campaigns, and workflows share one table with sorting, faceted filters, and bulk delete.
Unsubscribe and preference pages are now available in Japanese.
Differences in letter case or stray whitespace no longer create duplicate contacts.
8 updates
Filter on membership of another segment, or on events a contact has not triggered recently. A win-back audience takes 2 rules.
Explore the feature: Segments built from segmentsPreview as now lists contacts from the campaign's segment, so you check the email with data from someone who will receive it.
Self-hosted instances can choose the subdomain used as the MAIL FROM domain for verified domains.
Use contact and event data in the URL, headers, and body of a workflow webhook step.
Copy a workflow with all its steps and branches, then edit the copy.
The Update contact step can now subscribe or unsubscribe the contact.
Check SPF, DKIM, DMARC, and MX records, inspect email headers, or test an email for spam.
Paste a list of email addresses to add the matching contacts to a static segment in one go.
6 updates
Jump to any page, recent item, or project from anywhere in the dashboard.
New projects start with a short checklist based on what you use Plunk for: campaigns, transactional email, or automations.
Get started
2 of 4Self-hosted instances can raise the attachment size and count, up to the 40 MB that SES allows.
Set a field to null to remove it from a contact. Empty strings are ignored, so they never overwrite existing data.
Delivery, open, and bounce events include the ID returned by the send request, so you can match each one to its email.
Send your own HTML without the Plunk footer. Unsubscribed contacts are still skipped.
3 updates
A condition step can split into as many branches as you need, like a switch statement, with a default branch for everything else.
Explore the feature: Multi-branch conditionsCondition
Which plan are they on?
Unsubscribe and preference pages are now available in Simplified, Traditional, and Hong Kong Chinese.
Unsubscribe and preference pages are now available in Italian.
5 updates
Receive email at any address on your domain. Senders are added as contacts, and every message triggers an event and a webhook.
Explore the feature: Inbound emailAna Ruiz
To support@
Can you resend my invoice?
New contact
Ana Ruiz
Add contacts to a segment by hand. Its members only change when you change them.
Unsubscribe and preference pages are now available in Spanish, Polish, and Czech.
Switch an existing workflow to a different trigger event without rebuilding it.
Send a workflow email to your team or any other address, not only the contact.
5 updates
Attach an image with a Content-ID and reference it from your HTML. It appears in the email body instead of as an attachment.
Read the docs: Inline imagesThanks for your order
Receipt #4021 from Loop Studio
Filter the activity feed to bounces and complaints, the events that affect your sending reputation.
Unsubscribe and preference pages are now available in Portuguese and Bulgarian.
Match contacts whose date field is more than a set number of days, weeks, or months in the past.
Block new account signups so only existing users can sign in.
7 updates
Open any sent email from a contact's page or the activity feed to see exactly what they received.
Welcome to Loop
From hello@loopstudio.io
Hi Ana, your workspace is ready. Here are three things to try first.
Set a language per project, or per contact with a locale field, and these pages follow it. Plunk supports 17 languages today.
Se désabonner
Ne plus recevoir les e-mails de Loop Studio ?
Se désabonnerSee your project's bounce and complaint rates next to Plunk's thresholds, with a warning well before a rate is high enough to disable the project.
Last 7 days
HealthyWarning at 5%
Warning at 0.075%
Check an address for valid syntax, disposable domains, plus-addressing, and MX records before you add it.
Select contacts across pages, or every contact at once, then subscribe, unsubscribe, or delete them together.
Start a campaign from a template, or duplicate a campaign you already sent.
Hand-written HTML templates open in a CodeMirror editor with syntax highlighting and code folding.
Start on the free plan with 1,000 emails a month, no credit card needed. When you need more, every email is $0.001, with unlimited contacts and every feature included.