SendGrid vs Mailgun: Which Should You Use in 2026?

SendGrid vs Mailgun — here is the honest comparison, and a third option worth knowing.

The short version

Both are developer-first email APIs. SendGrid leans marketing + transactional with a bigger UI; Mailgun is more API/developer-focused with strong routing and analytics.

The thing both share

On shared IP pools, your reputation depends partly on other senders, and both will review or restrict 'high-risk' senders. A dedicated, isolated IP with managed deliverability avoids that entirely.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability — and it welcomes the senders Amazon SES, SendGrid and Mailchimp reject, from $8. Run the free 10-second checker or see plans.