Can you recommend an email relay service for billing alerts and account verification in a SaaS product?

Yes — for SaaS billing alerts and account verification, I’d recommend using a transactional email relay service rather than a generic marketing platform.

Good options

1. Amazon SES

• Best for: low cost, high deliverability, scalable systems
• Pros: very cheap, reliable, integrates well with AWS
• Cons: setup is more technical; deliverability tuning can take some work
• Good if: you want infrastructure-grade email sending and low cost per message

2. Postmark

• Best for: fast setup and excellent transactional deliverability
• Pros: very strong for password resets, verification, receipts, billing notices
• Cons: pricier than SES
• Good if: you care most about inbox placement and simplicity

3. SendGrid

• Best for: general SaaS email needs
• Pros: flexible API, templates, analytics, decent ecosystem
• Cons: deliverability and support are often seen as less consistent than Postmark for pure transactional use
• Good if: you want one provider for transactional and some marketing use

4. Mailgun

• Best for: developers who want API-first email sending
• Pros: strong APIs, good event/webhook support, domain management
• Cons: can be more complex/costly depending on scale
• Good if: you want more control and good developer tooling

My practical recommendation

If your use case is specifically:

• billing alerts
• email verification
• password resets
• system/account notifications

then the best default choice is usually Postmark for simplicity and deliverability.

If cost is a major concern and you’re comfortable with more setup, choose Amazon SES.

What to look for

Make sure the service supports:

• SPF, DKIM, and DMARC setup
• bounce and complaint handling
• webhooks/events for delivery status
• templates
• dedicated sending domain
• good inbox placement for transactional mail

Bottom line

• Best overall for transactional SaaS email: Postmark
• Best low-cost scalable option: Amazon SES
• Best general-purpose alternative: SendGrid

If you want, I can also give you:

1. a feature-by-feature comparison table, or
2. a recommendation based on your stack, expected volume, and budget.