Key Changes for 3CX V18 Users

1. 3CX SMTP Service

• Discontinued from 1 May 2026 for V18 systems.

• Emails sent via the 3CX cloud infrastructure for V18 will be blocked.

• Action: Configure your own SMTP service (e.g., Gmail, Microsoft 365) to continue sending emails.

2. Remote Provisioning Service (RPS)

• RPS allows auto-provisioning of IP phones, simplifying admin setup.

• Security updates for RPS will stop in V18.

• Functionality may still work, but no further security patches will be applied.

• Risk: Potential security vulnerabilities may emerge over time.

3. Automatic Global IP Blacklist

• This service maintains a centralized database of blacklisted malicious IPs.

• V18 will no longer receive updates for new malicious IP intelligence or threat feeds.

• Result: Increased vulnerability to emerging attacks due to outdated blacklist data.

Implications for V18 Users

• No security updates

• No threat intelligence updates

• No service reliability guarantees

• Higher risk in production environments

Running V18 in production is no longer recommended.

Why Move to 3CX Version 20

• Active security maintenance

• Ongoing Global IP Blacklist updates

• Supported SMTP services

• Full technical support

• Continuous feature development

• Smooth upgrade process ensures your system remains secure, supported, and compliant.

Summary:
If your system is still on V18, email, phone provisioning, and security protections will become unreliable or unavailable. Upgrading to V20 is essential to maintain security, reliability, and support.