What email provider should I use for password resets and OTPs?

For password resets and OTPs, you want an email provider that is:

• Highly deliverable to major inboxes
• Fast and reliable
• Supports transactional email
• Has good reputation management, SPF/DKIM/DMARC support, and API access

Good choices

1. Postmark

Best overall for transactional email

• Excellent deliverability
• Designed specifically for transactional messages like OTPs and resets
• Fast sending and simple setup
• Great if you care mostly about reliability, not marketing

2. SendGrid

Best for flexibility

• Widely used
• Supports both transactional and marketing email
• Good APIs and integrations
• More feature-rich, but can be more complex

3. Amazon SES

Best for cost

• Very cheap at scale
• Solid deliverability if configured well
• More setup/ops effort than Postmark
• Good if you already use AWS

4. Mailgun

Good developer-focused option

• Strong API and tooling
• Good for transactional email
• Deliverability is generally good, but some teams prefer Postmark for critical auth emails

My recommendation

If your main use case is password reset and OTP emails, I’d choose:

• Postmark if you want the safest, simplest option
• Amazon SES if cost matters most and you’re comfortable with more setup
• SendGrid if you also need marketing email later

Important setup tips

No matter which provider you choose:

• Use a dedicated sending domain like mail.yourdomain.com
• Set up SPF, DKIM, and DMARC
• Send from a recognizable address like no-reply@yourdomain.com
• Keep OTP/reset emails short and plain
• Avoid spammy phrases and too many links

Practical note

For auth emails, deliverability matters more than brand name. A provider with excellent inbox placement and proper DNS setup is better than a popular one with poor configuration.

If you want, I can also recommend the best provider based on your stack, budget, and expected volume.