Mailazy vs Plunk (2026): which should you pick?

Pick Mailazy if

• Fits if you run a product with a few thousand users and want emails triggered by behaviour
• Works for teams that already pay for SES, SendGrid or Mailgun

Look elsewhere if

• Skip it if you want one bill, as the SMTP sending is paid to a separate provider
• Pricey if you need behavioral rules, which start at $49 a month and allow just 1 on Pro
• Tight if you stay free, with 1 automation and 1,000 contacts
• Watch out: SSO and white label need Business at $199 a month
• Watch out: the page does not say whether the free plan includes behavioral rules

Pick Plunk if

• Fits if you send a few thousand emails a month and want pay-as-you-go
• Works for developers who might self-host it later

Look elsewhere if

• Tight if you send more than 1,000 emails a month on the free plan, which also adds Plunk branding
• Pricey if your volume grows, since it is a flat $0.001 on every email
• Watch out: self-hosting under AGPL-3.0 carries that licence's obligations
• Watch out: the hosted service runs in the EU

Mailazy

• Mailazy does not send mail itself; you pay your SMTP provider separately for the emails.
• The free plan allows 1 automation and the Pro plan 1 behavioral email rule, with 10 on Business.
• SSO and white label need the Business plan at $199 per month.
• The page does not say whether the Free plan includes the behavioral email rules.

Plunk

• The free plan stops at 1,000 emails a month and puts Plunk branding on emails.
• The paid plan has no monthly fee: it is $0.001 per email, so cost scales directly with volume.
• The hosted service is in the EU; self-hosting under AGPL-3.0 carries that license's obligations.

Mailazy

Behavioral emails

Rules sent when users do, or stop doing, something in the product, written in plain English.

Automations

A visual canvas for drip sequences with waits between emails.

Newsletters

Send and schedule newsletters, with open and click reports and UTM tags on links.

Email designer and AI drafts

Block-based designer with templates; AI drafts start on the Pro plan.

Chat control

An MCP integration lets Claude or ChatGPT operate the account.

Bring your own SMTP

Sending goes through your own provider, such as Amazon SES, billed by that provider.

Plunk

Transactional email

Send single emails through a REST API or an SMTP relay, from your own domain with DKIM signing.

Campaigns and newsletters

Broadcasts go to the whole contact list or to a segment, with a visual and an HTML editor and open and click tracking.

Workflows

Event-triggered sequences with delays, conditions and webhook steps, started by something a contact does in your product.

Segments

Dynamic segments are queries that re-run each time they are used, so a campaign reaches the current audience.

Inbound email

Addresses at your domain can receive mail, and replies become contacts that can start workflows.

Self-hosting

The code is open source under AGPL-3.0 and can be deployed with Docker Compose on your own servers.

Mailazy

• Free$0

  1 team member, 1,000 contacts, 5,000 emails a month, newsletters and 1 automation, with docs and community help.

• Pro$49

  per month for 2 team members, billed monthly ($490 billed yearly)

  25,000 contacts, 100,000 emails a month, automations, AI drafts, 1 behavioral email rule and email support.

• Business$199

  per month for 5 team members, billed monthly ($1,990 billed yearly)

  Unlimited contacts and emails, 10 behavioral email rules, SSO, white label and priority support.

• EnterpriseCustom

  Unlimited team members and rules, 99.9% uptime SLA, SOC 2 report and DPA, private cloud and data residency add-ons.

Plunk

• Free forever$0

  1,000 emails a month and unlimited contacts. Every feature is included, but emails carry Plunk branding.

• Pay as you grow$0.001

  per email sent, no monthly fee

  Removes the Plunk branding and the 1,000-email cap, with a monthly spend cap you can set. The vendor's example shows 10,000 emails costing $10.

Mailazy

• Annual discount

  2 months free with yearly billing

  Pro is $490 a year and Business $1,990 a year, against $49 and $199 a month.

Plunk

No public discounts listed.