Acceptable Use Policy

This policy supplements our Terms of Service (section 4, Acceptable use).

mails.ai is transactional email infrastructure. You may send only to recipients who have a direct, existing relationship with you or your end users — account holders, people who explicitly opted in, or people who initiated the conversation being replied to. Every message sent through mails.ai is a single, 1:1 message triggered by the recipient’s own interaction.

Prohibited without exception

• Unsolicited, bulk, cold, or prospecting email of any kind.
• Cold outreach of any kind.
• Purchased, scraped, or rented recipient lists.
• Marketing campaigns, segmented broadcasts, or audience blasts — mails.ai ships no such features, and they may not be assembled on top of the API.

Enforcement

Every permanent bounce and every spam complaint is written to a suppression list that is enforced on every send — a repeat send to a suppressed address is rejected before it leaves the system. Automated reputation monitoring auto-suspends any sender exceeding a 0.3% complaint rate (below AWS SES’s 0.5% threshold) or a 5% bounce rate. We run on AWS SES and comply with the AWS Acceptable Use Policy; anything AWS prohibits is prohibited here, regardless of the terms above.