MailerSend – free plan: up to 3,000 emails per month
SMTP2Go – free plan: up to 1,000 emails per month
SendPulse – free plan: up to 12,000 emails per month
Brevo (formerly Sendinblue) – free plan: up to 300 emails per day
Mailjet – free plan: up to 200 emails per day
Aha Send – free plan: up to 1,000 emails per month
Mailtrap – free plan: up to 1,000 emails per month
Postmark – free plan: up to 100 emails per month
SendGrid – free plan: up to 100 emails per month
Gmail – free plan: up to 500 emails per day
Elastic Email – free plan: up to 100 emails per day
