Doppler Transactional review
A flexible relay for high-volume email, especially FTP-based batch workflows.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Doppler Transactional, also branded Doppler Relay, is a paid transactional email service for ecommerce businesses, web applications, websites, and other online businesses. It handles automated messages such as purchase confirmations, account notifications, password resets, and emails with attachments. Delivery is available through SMTP, a REST API, or FTP batch sending with CSV processing, making it suitable for teams that need both application-triggered messages and scheduled file-based delivery.
Pricing is organized by monthly email volume. The 50k plan costs $30 per month and includes API and SMTP. The 100k plan costs $58 per month with the same connection options. At 250k for $204 per month, dedicated IP access is added, and it remains part of the 500k plan at $322 per month and the 1M plan at $541 per month. The published offer also includes a 30-day trial, with up to 400 emails per day and no credit card. There is no permanent free plan, so ongoing use starts with a paid tier.
Its strongest fit is a sender that values delivery-channel choice and operational reporting. Transactional templates support custom fields, while reports cover deliveries, opens, clicks, and bounces. DKIM, SPF, and DMARC authentication support domain configuration, and shared or dedicated IP options provide a choice of sending arrangements. Test mode can simulate bounces, unsubscribes, and spam claims before live sending. Choose Doppler Transactional for high-volume SMTP, API, or FTP workflows; teams seeking a permanent free service or a lower-volume dedicated-IP entry point should consider another option.
Doppler Transactional pros and cons
- Where it wins
- Supports SMTP, REST API, and FTP batch delivery with CSV processing
- Includes templates, delivery reports, tracking, and bounce reporting
- Offers DKIM, SPF, DMARC, shared IPs, and dedicated IPs
- Where it doesn't
- There is no permanent free plan
- Dedicated IPs begin with the 250k plan
- The trial allows up to 400 emails per day
Doppler Transactional fact sheet, pricing and score →
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