SMTP

Xurel accepts authenticated SMTP submission for apps and legacy clients that cannot use the REST API.

Connection settings

Host smtp.xurel.co

Port 587 (STARTTLS) or 465 (TLS)

Username apikey

Password your API key (xrl_prd_… or xrl_dev_…)

Auth PLAIN / LOGIN

swaks --to user@example.com \
  --from hello@yourdomain.com \
  --server smtp.xurel.co:587 \
  --auth LOGIN \
  --auth-user apikey \
  --auth-password "$XUREL_API_KEY" \
  --tls \
  --header "X-Xurel-Type: transactional" \
  --body "Hello from SMTP"

Optional headers

Header	Purpose
`X-Xurel-Type`	`transactional` or `marketing`
`X-Xurel-Idempotency-Key`	Same semantics as REST Idempotency-Key
`X-Xurel-Tags`	Comma-separated tags
`X-Xurel-Topic`	Topic id for marketing

Limits

Same plan rate limits and domain verification rules as REST. See SMTP setup guide.