Email

coss.com Email sends from domains you verify, keeps per-recipient delivery status, and tells you what happened through webhooks and logs. The product page covers what it is for and what it costs; these guides cover how to use it.

Send and receive

• Sending email: single, batch and scheduled sends, with attachments, headers and tags.
• Templates: drafts, versions, locales and typed variables.
• SMTP relay: for apps that can't call an API.
• Receiving email: turn incoming mail into webhooks and threads.

Get your mail delivered

• Domains: what to verify before sending live email.
• Transactional and marketing email: why they travel in two streams.
• Suppressions, DMARC, dedicated IPs and BIMI.
• Sub-accounts: email for your platform's own customers.

See what happened

• Delivery status: statuses and events for every recipient.
• Open and click tracking.
• Content storage: keep no copy of what you send.

Marketing email

• Contacts, audiences and segments, and topics and preferences.
• Unsubscribe and broadcasts.

Moving from another provider? Import your account from Resend, SendGrid or Postmark.