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Documentation Index

Fetch the complete documentation index at: https://docs.edbb.com/llms.txt

Use this file to discover all available pages before exploring further.

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Outbound SMTP Policy

EDBB keeps TCP port 25 open so you can run your own mail services. To protect shared IP reputation, outbound traffic is rate-limited to 8 packets per second with an initial burst of 16 pps.

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Why We Rate-Limit Port 25

🛡️ IP Reputation

Throttling prevents sudden spam bursts that could land shared IP ranges on blocklists.

⚖️ Fair Usage

Keeps one VPS from monopolizing outbound SMTP bandwidth.

🚫 Abuse Deterrence

Makes the platform less attractive for spammers while staying practical for legitimate email.

📅 Consistent Policy

Applies to every VPS created after 24 February 2025. The limit is not adjustable per account.

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What This Means for You

  • Transactional email, server alerts, and admin notifications operate normally.
  • Bulk campaigns or newsletters should use dedicated providers (SendGrid, Mailgun, Amazon SES, etc.).
  • Exceeding the limit will slow delivery but won’t block single messages outright.
  • EDBB enforces a strict no-spam policy—verified abuse leads to suspension without refund.

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Best Practices

  1. Configure SPF, DKIM, and DMARC to improve deliverability.
  2. Monitor mail queues and bounce reports; most issues stem from application misconfiguration rather than the rate limit.
  3. Keep abuse contacts current in WHOIS/RDAP so you can respond quickly to complaints.
  4. For high-volume sending, integrate with a reputable SMTP relay service.
Need clarifications for compliance requirements? Reach out to EDBB Support via the messenger or by email before launching your mail workload. Contact EDBB Support