> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arct.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# Email Sending & Ports

> Outbound email (SMTP) ports and sending rules.

## Outbound Email (SMTP)

Outbound ports 25 and 465 are blocked; port 587 is open. After one paid month, you may submit a support ticket describing your use case for individual review, but approval is not guaranteed. For volume sending, use an email delivery API.