What it does
MailerSend provides an email API, SMTP relay, template builders, activity logs and suppression management. It handles bounces, complaints and unsubscribes while letting you inspect them by account or domain. The ongoing Free plan sends 500 emails per month but requires account approval and a payment card.
When an address stops receiving MailerSend messages, inspect the suppression category before changing templates or sending again. Hard bounces, spam complaints and unsubscribes are added automatically; recurring soft bounces go onto a temporary on-hold list. Known addresses, domains or matching patterns can also be blocked manually.
A team operating several brands can filter suppressions by domain and export them for use in another system's blocklist. That is a practical way to keep an opt-out or failed address visible when email systems coexist. The free plan includes 500 emails per month, one sending domain and one day of activity retention. Longer history and more domains require a different package; extra usage and some verification or domain additions have separate charges.
Signup starts a 14-day trial of Professional features. After account approval, activate the continuing Free plan in Plan and billing by entering the organization's address and card details. The card is required to prevent abuse; MailerSend says it does not charge for the Free plan. Hobby raises sending to 5,000 emails per month at USD $7 billed monthly, or USD $5.60 per month billed yearly.
Strengths
- Suppression filters distinguish an entire account from an individual domain
- CSV export supports carrying suppression records into other systems
Watch out for
- The free plan has a 500-email monthly allowance and one day of activity history
- Activating the continuing Free plan requires account approval and card details
Best for
- Application teams managing transactional email across one or more brands
Sources
- Email Sending Service - MailerSend (Oct 25, 2026)
- Suppression List Management - MailerSend (Oct 25, 2026)
- MailerSend pricing (Oct 27, 2026)
- Create a MailerSend account (Oct 27, 2026)