ESPs
Email service providers for transactional and marketing sending.
- Reading time:
- 3 min
- Difficulty:
- Beginner
- Estimated duration:
- 3 min
- Prerequisites:
- None
- Last updated:
- July 2026
- Author:
- Empire
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Alternatives & related tools
- SendGridTransactional and marketing email platform with APIs, SMTP, and authentication tooling.
- MailgunDeveloper-focused email API for transactional sending and inbound routing.
- Amazon SESHigh-scale cloud email sending with fine-grained infrastructure control on AWS.
- PostmarkReliable transactional email with strong deliverability defaults and message streams.
Related Workflows
- Diagnose authentication failuresTrace SPF/DKIM/DMARC failures to a remediable cause.
- Audit multi-domain authenticationReview authentication across a domain portfolio.
- Authenticate a new domainPublish SPF, DKIM, and DMARC for a new sending domain and verify authentication before warmup.
- Recover from Gmail spamExit Gmail Spam using Postmaster signals, authentication fixes, and controlled volume.
- Check authenticationRegularly verify SPF, DKIM, and DMARC alignment and report pipelines.