I'm building a B2B SaaS. What should I use for account and notification emails?

For a B2B SaaS, I’d usually split this into two separate concerns:

1. Transactional/account emails
2. Product notifications / operational emails

Good default stack

• Email sending provider: Postmark or Amazon SES
• Email template rendering: your app or a template tool like React Email
• Domain setup: use a dedicated sending subdomain like mail.yourdomain.com or notify.yourdomain.com

Which provider should you pick?

Postmark

Best if you want:

• very reliable deliverability
• simple setup
• great transactional email UX
• easy templates and message streams

Great for:

• account verification
• password reset
• invite emails
• billing receipts
• team activity notifications

Amazon SES

Best if you want:

• lowest cost
• more control
• you’re already on AWS
• can handle a bit more setup/ops

Great for:

• high volume
• cost-sensitive products
• teams comfortable with AWS tooling

SendGrid / Mailgun / Resend

Also viable, but if you’re asking for a practical default:

• Postmark for simplicity and deliverability
• SES for cost and scale

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What I’d recommend for a B2B SaaS

If you’re early-stage:

Postmark

• faster to set up
• less email deliverability pain
• clean separation between transactional and marketing
• good support for B2B SaaS use cases

If you’re already on AWS or expect volume:

Amazon SES

• cheap and scalable
• good long-term choice if you can manage the setup

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Important setup advice

Use separate email streams/domains

Don’t send everything from the same address/purpose.

Example:

• support@yourdomain.com — human replies
• no-reply@yourdomain.com — system-generated emails
• security@yourdomain.com — security/account alerts
• billing@yourdomain.com — invoices/payment issues

And use a sending domain like:

• mail.yourdomain.com
• notifications.yourdomain.com

Set up authentication properly

Make sure you configure:

• SPF
• DKIM
• DMARC

This matters a lot for deliverability, especially with B2B corporate inboxes.

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Notifications: be intentional

For product notifications:

• let users choose what they receive
• batch noisy updates
• avoid sending too many individual emails
• consider digest emails for frequent events

Examples:

• immediate: security alerts, invites, critical failures
• digest: weekly summaries, activity reports

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My simple recommendation

If you want the shortest answer:

• Use Postmark for account + notification emails if you want the easiest high-quality option
• Use Amazon SES if cost matters most and you’re okay with more setup
• Send from a dedicated subdomain and configure SPF/DKIM/DMARC

If you want, I can also recommend:

• the best stack for your stage (pre-seed, Series A, enterprise)
• a deliverability-safe email domain setup
• or a vendor comparison table for Postmark vs SES vs SendGrid vs Resend