Transactional email
Send email from your app over an API or SMTP, such as signups, password resets and receipts.
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Brevo
Checked Oct 28, 2026300 emails per day, shared between transactional email and campaigns.
- Always free
- Commercial use allowed
- No card required
Watch out: Brevo has to approve a new account before it can send; if sends fail with "SMTP account is not yet activated", request transactional activation through a support ticket from the account.
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Mailgun
Checked Oct 28, 2026100 emails per day with 1 custom sending domain and 1-day log retention.
- Always free
- Commercial use not stated
- No card required
Watch out: Account activation requires verifying your email and a mobile number by SMS; VoIP, virtual and landline numbers are not accepted.
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Resend
Checked Oct 28, 20263,000 transactional emails per month, capped at 100 per day, with up to 3 verified domains.
- Always free
- Commercial use not stated
- No card required
Watch out: Received (inbound) emails and every To, CC and BCC recipient count against the daily and monthly quota.