Getting started

SMTP relay

For frameworks and tools that speak SMTP. Sign in with an API key and send from your verified domain.

Setting	Value
Host	`smtp.chebu.email`
Port	`587` with STARTTLS, or `465` with TLS
Username	`chebu`
Password	An API key with sending access

The From address must be on a verified domain in the key's workspace, and within the key's domain if it has one. Relay mail follows the same rules as the API: up to 50 recipients per email, and each email counts once toward your monthly sends.

Send over SMTP

# message.eml holds the full message, headers first:
#   From: Northwind <[email protected]>
#   To: [email protected]
#   Subject: Your receipt #1042
#
#   Thanks for your order.
curl --url smtp://smtp.chebu.email:587 --ssl-reqd \
  --user "chebu:$CHEBU_API_KEY" \
  --mail-from [email protected] \
  --mail-rcpt [email protected] \
  --upload-file message.eml

Use the API instead when you need scheduling, batches, or idempotency keys.