Here's a problem almost every SaaS founder hits: you need transactional email (password resets, receipts, notifications) AND marketing email (campaigns, sequences, newsletters). So you sign up for Postmark for transactional and ConvertKit for marketing. Now you're paying for two tools, managing two dashboards, and your subscriber data lives in two places.

It doesn't have to be this way. Several platforms now handle both transactional and marketing email under one roof. The question is which ones do it well, and which ones just bolt transactional onto a marketing tool (or vice versa) as an afterthought.

I've used or tested all of these. Here's what actually works.

Why One Platform Matters

Before the list, here's why combining transactional and marketing email matters:

Unified subscriber profile. When transactional and marketing live in the same system, you have one view of each customer. You can see that a user received a password reset, opened your last campaign, and triggered a dunning sequence, all in one place.

Simpler infrastructure. One set of DNS records, one sending domain configuration, one API to integrate. Less surface area for things to break.

Lower cost. Two separate tools cost more than one combined tool at the same volume. The savings add up, especially as you scale.

Better automation logic. When both email types share the same system, you can build automations that span both. "When a user signs up (transactional welcome), wait 3 days, then start the onboarding sequence (marketing)" without duct-taping two APIs together.

The 7 Best Combined Platforms

1. Sequenzy

Best for: SaaS founders who want one platform for everything

Sequenzy was designed from day one to handle both transactional and marketing email. The transactional API lets you send password resets, receipts, and notifications. The marketing side handles campaigns, automated sequences, and newsletters.

What makes it different: the same subscriber profile receives both types of email. When you send a receipt (transactional), the marketing system knows. When a user clicks a campaign link (marketing), the transactional system has that context. No data syncing between tools.

The Stripe integration adds another layer. Subscription events automatically trigger both transactional emails (payment receipt) and marketing sequences (dunning, lifecycle) from the same platform.

Pricing: Starts at $29/month based on email volume Transactional strength: API-first sending, template support, fast delivery Marketing strength: AI-powered sequences, behavioral triggers, campaign builder Pros:

True unified platform, not two products stitched together
Single subscriber profile for both email types
Native Stripe integration
Pay for emails sent, not contacts
Direct founder support

Cons:

Newer platform
No SMS
Smaller template library than older competitors

2. Postmark + DMARC (Transactional Focus)

Best for: Developers who prioritize transactional deliverability above all else

Postmark is the gold standard for transactional email deliverability. They recently added "Message Streams" that separate transactional and marketing (they call it "Broadcast") sending. So you can now send both from Postmark.

The caveat: the marketing features are basic compared to dedicated marketing platforms. You get broadcasts (one-time sends to a list) but not automated sequences, behavioral triggers, or sophisticated segmentation. If your marketing needs are simple newsletters and occasional announcements, it works. If you need lifecycle automation, you'll outgrow it.

Pricing: Starts at $15/month for 10,000 emails Transactional strength: Industry-leading deliverability, sub-second delivery Marketing strength: Basic broadcasts, simple templates Pros:

Best transactional deliverability in the industry
Clean API and excellent documentation
Message Streams separate reputation
45-day message retention for debugging

Cons:

Marketing features are very basic
No automated sequences or behavioral triggers
No visual automation builder
Limited segmentation

3. Resend

Best for: Developers who want a modern API for both types

Resend is a developer-focused email platform that handles both transactional and marketing. Built by a former Vercel engineer, it has a clean API, React Email integration, and modern developer experience.

The transactional API is solid and developer-friendly. The marketing side (Audiences + Broadcasts) is still maturing but covers the basics. If you're a developer who values DX over feature count, Resend is worth looking at.

Pricing: Free for 100 emails/day, paid from $20/month Transactional strength: Modern API, React Email support, good DX Marketing strength: Audiences, broadcasts, basic automation (improving) Pros:

Excellent developer experience
React Email native support
Clean, modern API
Growing quickly with active development

Cons:

Marketing features still maturing
Limited automation compared to dedicated marketing tools
Newer platform
Audience management is basic

4. Brevo (formerly Sendinblue)

Best for: Budget-conscious teams wanting a full-featured combined platform

Brevo has offered both transactional and marketing for years. The transactional API (SMTP relay or API) handles system emails, while the marketing side has campaigns, automation, and a visual workflow builder.

The platform is feature-rich and affordable, but the interface feels dated compared to newer tools. The automation builder works but isn't as intuitive as more modern platforms. For the price, though, it's hard to beat on features.

Pricing: Free for 300 emails/day, paid from $25/month Transactional strength: SMTP relay and API, decent deliverability Marketing strength: Full automation builder, campaigns, SMS too Pros:

Both transactional and marketing included in all plans
SMS and WhatsApp in addition to email
Affordable pricing
Feature-rich automation builder

Cons:

Interface feels dated
Transactional deliverability not as strong as dedicated services
Support can be slow
Free tier is very limited

5. Mailgun

Best for: High-volume senders who need infrastructure-level control

Mailgun is primarily an email infrastructure provider (API + SMTP) that can handle both transactional and marketing. It's more of a sending engine than a complete marketing platform.

For transactional, it's solid. Good deliverability, fast delivery, detailed analytics. For marketing, you'll need to build more yourself or use their basic template and list management features. It's best for teams with development resources who want control over the sending infrastructure.

Pricing: Free trial with 100 emails/day, paid from $35/month Transactional strength: Strong API, good deliverability, detailed logs Marketing strength: Basic list management, templates, scheduling Pros:

Strong infrastructure-level control
Good deliverability monitoring tools
Detailed sending analytics and logs
Handles high volume well

Cons:

Not a full marketing platform
No visual automation builder
Requires development resources
Marketing features are minimal

6. Amazon SES + Marketing Layer

Best for: AWS-native teams wanting the cheapest possible sending

Amazon SES is the cheapest email sending service available ($0.10 per 1,000 emails). It handles both transactional and marketing sending, but it's pure infrastructure. No automation, no templates, no subscriber management.

You'd use SES as the sending layer and build marketing features on top (or use a tool that sits on SES). Several email platforms actually use SES under the hood.

Pricing: $0.10 per 1,000 emails (incredibly cheap at scale) Transactional strength: Reliable, cheap, AWS-native Marketing strength: None built in (you build or use a layer on top) Pros:

Cheapest sending at scale
Integrates with AWS ecosystem
Reliable infrastructure
No contact-based pricing

Cons:

Zero marketing features
Requires significant development work
IP reputation management is on you
Setup and configuration is complex

7. Customer.io

Best for: Technical teams wanting sophisticated automation across both types

Customer.io handles both transactional (API-triggered) and marketing (campaign/workflow) email with a powerful event-driven automation engine. The transactional API sends system emails while the marketing workflows handle lifecycle automation.

The platform is powerful but complex. Setup takes longer than simpler tools, and the pricing reflects its enterprise-leaning positioning. For teams with technical resources who need sophisticated multi-channel automation, it's one of the best options.

Pricing: Starts at $100/month Transactional strength: API-triggered messages, good deliverability Marketing strength: Powerful workflow builder, event-driven, multi-channel Pros:

Powerful event-driven automation
Both transactional and marketing in one
Supports email, push, SMS, and in-app
Flexible data model

Cons:

Expensive starting price
Complex setup
Steep learning curve
Overkill for simple use cases

Comparison at a Glance

When choosing between these platforms, consider where you are and what you need:

Early stage, want simplicity: Sequenzy or Resend. Both handle both types with minimal setup.

Developer-first, want control: Resend or Mailgun. Best APIs and developer experience.

Budget is the priority: Brevo or Amazon SES. Most email per dollar.

Transactional deliverability is critical: Postmark. Nothing beats their inbox placement for transactional email.

Need sophisticated automation: Customer.io. Most powerful workflow engine for complex use cases.

The Real Trade-offs

Deliverability Separation

The main argument against combining transactional and marketing is deliverability risk. Marketing emails get more spam complaints, which can affect sender reputation. If transactional and marketing share the same sending infrastructure, a spam complaint on a campaign could theoretically impact your password reset delivery.

Good combined platforms handle this with separate sending streams, different IPs, or subdomain isolation. Ask how any combined platform handles reputation separation before committing.

Feature Depth vs. Breadth

Dedicated transactional services (Postmark) have deeper transactional features. Dedicated marketing platforms (ConvertKit, Mailchimp) have deeper marketing features. Combined platforms trade some depth for the convenience of one system.

For most SaaS companies under 50,000 subscribers, a good combined platform has enough depth on both sides. You'd only need to split when you hit scale that demands specialized infrastructure.

FAQ

Is it safe to send transactional and marketing from the same domain? Yes, if the platform uses separate sending streams. Most good combined platforms send transactional and marketing through different IP pools or subdomains, keeping reputation isolated.

Will I save money with a combined platform? Usually yes. Two separate tools at 10,000 contacts might cost $50 + $70 = $120/month. A combined platform at the same volume is typically $30-100/month.

What if I outgrow the combined platform? Most combined platforms let you export your data. If you eventually need separate specialized tools, you can migrate. Starting combined and splitting later is easier than the reverse.

Do combined platforms have worse deliverability? Not inherently. Deliverability depends on the platform's infrastructure, your sending practices, and your list quality. Some combined platforms (like Postmark) have best-in-class transactional deliverability.

Should I use transactional email for marketing to avoid spam filters? No. This is technically abuse of the transactional channel and can get your account suspended. Keep transactional for user-triggered, expected messages only.