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Rocket supports six email and messaging integrations. This page helps you pick the right one for your project.
Quick answer:
  • Transactional emails (receipts, password resets, notifications): Use Resend or SendGrid.
  • Marketing emails (campaigns, newsletters, drip sequences): Use Mailchimp, MailerLite, or Brevo.
  • SMS messages (verification codes, alerts, reminders): Use Twilio.
  • All-in-one (email + SMS + CRM in a single platform): Use Brevo.

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Comparison table

Scroll right to see all six services →
FeatureResendSendGridBrevoMailerLiteMailchimpTwilio
Best forTransactional emailsHigh-volume transactional + marketingAll-in-one (email + SMS + CRM)Newsletters and subscriber automationEmail campaigns and audience managementSMS messages
Transactional emailsExcellentExcellentGoodLimitedLimitedN/A (SMS only)
Marketing emailsNoGoodGoodExcellentExcellentN/A
SMS supportNoNoYesNoNoYes
Built-in CRMNoNoYesNoNoNo
Free tier3,000 emails/month100 emails/day (permanent)300 emails/day500 subscribers500 contactsTrial credits
Developer experienceExcellent (modern API)GoodGoodGoodGoodGood
Supabase SMTPYes (auth emails)YesYesNoNoN/A
Connection methodAPI keyAPI keyAPI keyAPI keyOAuthAPI key

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Detailed recommendations

Use Resend.Resend is purpose-built for transactional emails with excellent deliverability and a clean developer API. It also works with Supabase SMTP, so you can route authentication emails (password resets, magic links) through Resend for consistent branding.Pair with: Supabase (auth) + Stripe (payments)
Connect Resend and send a welcome email when a user signs up and an order confirmation after each Stripe payment.
Use SendGrid.SendGrid handles high volume reliably and includes both transactional and marketing email features. It has robust analytics for open rates, click tracking, and bounce management.
Connect SendGrid and send order confirmation emails with tracking links after each purchase. Include open and click tracking.
Use Mailchimp or MailerLite.Both are excellent for marketing campaigns. Mailchimp has more advanced features (A/B testing, complex automations, audience segmentation). MailerLite is simpler and more affordable, with a generous free tier.
  • Choose Mailchimp if you need advanced segmentation and A/B testing.
  • Choose MailerLite if you want simplicity and a free plan for up to 500 subscribers.
Add a newsletter signup form to the footer. When someone subscribes, add them to Mailchimp and send a welcome email sequence.
Use Brevo.Brevo (formerly Sendinblue) combines transactional email, marketing campaigns, SMS messaging, and a built-in CRM in one platform. It is the best choice if you want everything in one place without managing multiple integrations.
Connect Brevo. Send a welcome email when a user signs up, then an SMS reminder if they have not logged in after 3 days.
Use Twilio.Twilio is the standard for SMS. Use it for verification codes, two-factor authentication, order updates, and appointment reminders.
Add SMS verification to the signup flow using Twilio. Send a 6-digit code and verify it before creating the account.

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Browse email and messaging integrations

Resend

Developer-first transactional email with high deliverability.

SendGrid

High-volume email delivery for transactional and marketing.

Brevo

All-in-one email, SMS, and CRM (formerly Sendinblue).

MailerLite

Simple email marketing, newsletters, and automation.

Mailchimp

Email campaigns, audience management, and A/B testing.

Twilio

SMS messages for verifications, alerts, and notifications.