Do I need a dedicated transactional email provider for signup and reset emails?

Not necessarily—but often yes, if you care about deliverability and reliability.

Short answer

You can send signup, password reset, and other transactional emails:

• from your app’s existing email system if volume is low and you already have good mail infrastructure, or
• through a dedicated transactional email provider if you want better inbox placement, monitoring, retries, and separation from marketing mail.

When a dedicated provider is worth it

Use one if you need any of these:

• High deliverability for critical emails like password resets
• Fast delivery and lower chance of throttling
• Bounce/complaint handling
• Email logs, retries, webhooks, and templates
• Separate reputation from marketing/newsletter emails
• Scalability as your app grows

Common transactional providers:

• SendGrid
• Postmark
• Mailgun
• Amazon SES
• Brevo / Mailjet (depending on needs)

When you may not need one

You might skip it if:

• Your app is very small or internal
• You only send a few emails per day
• You already have reliable SMTP through your host/provider
• You can tolerate some operational overhead

Important distinction

Try not to send transactional and marketing emails from the same domain/IP stream unless you know what you’re doing. Marketing campaigns can hurt the reputation of critical emails like resets and verification emails.

Practical recommendation

For a production SaaS app:

• Use a dedicated transactional provider for signup/reset/verification emails
• Use a separate marketing tool/provider for newsletters and promotions

If you want, I can recommend the best provider for your situation based on:

• expected email volume
• budget
• tech stack
• need for EU data residency / compliance