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Security4 min readUpdated December 2025

AppRiver Email Threat Protection

By BRITECITY Team | 15+ years experience

Last updated December 27, 2025

Written by BRITECITY's IT experts with expertise in managed it services, cybersecurity, cloud computing

AppRiver provides advanced email threat protection including spam filtering, malware detection, phishing prevention, and encryption for business email security.

AppRiver Email Threat Protection provides enterprise-grade email security for your business, blocking spam, malware, phishing attempts, and other email-borne threats before they reach your inbox.

What is AppRiver?

AppRiver is a cloud-based email security solution that filters all incoming and outgoing email through advanced threat detection systems. It acts as a protective layer between the internet and your email server, stopping threats before they can cause harm.

Key Features

Advanced Spam Filtering

  • Multi-layer spam detection using AI and heuristics
  • Blocks 99%+ of spam before it reaches your inbox
  • Customizable filtering rules per user or organization
  • Daily digest of quarantined messages

Malware & Virus Protection

  • Scans all attachments for known malware signatures
  • Sandboxing for suspicious attachments
  • Zero-day threat detection using behavioral analysis
  • Automatic quarantine of infected messages

Phishing Prevention

  • URL scanning and reputation checking
  • Display name spoofing detection
  • Domain impersonation protection
  • Real-time link rewriting and time-of-click analysis

Email Encryption

  • TLS encryption for email in transit
  • Policy-based encryption for sensitive data
  • Secure message portal for recipients
  • Compliance with HIPAA, FINRA, and other regulations

How It Works

AppRiver sits between your email server (Microsoft 365, Exchange, etc.) and the internet. All email passes through AppRiver's security filters before being delivered:

  1. Email arrives at AppRiver's secure cloud
  2. Multiple scans check for spam, malware, and phishing
  3. Clean emails are delivered to your inbox
  4. Threats are quarantined and you're notified

Managing Quarantined Email

When AppRiver blocks a suspicious email, it's placed in quarantine rather than deleted. You receive a daily digest showing all quarantined messages, allowing you to:

  • Release legitimate emails that were incorrectly flagged
  • Block senders to prevent future messages
  • Whitelist trusted senders
  • Report false positives to improve filtering

User Portal Access

Each user has access to a personal quarantine portal where they can:

  • View and manage quarantined messages
  • Adjust personal spam sensitivity settings
  • Manage allow and block lists
  • Access email continuity during outages

Need Assistance?

If you have questions about AppRiver email protection or need help with quarantine management, contact BRITECITY support:

  • Phone: 949-243-7440
  • Support Portal: Submit a ticket for assistance

Learn more about our other security solutions:

  • POLARITY Security Suite
  • Security Awareness Training

About the Author

BRITECITY Team

Written by the BRITECITY Team with over 15 years of combined IT experience. Our experts hold certifications including Microsoft Solutions Partner, CompTIA Security+, AWS Certified.

Managed IT ServicesCybersecurityCloud ComputingIT Strategy

Quick Answers

Why am I not receiving emails I'm expecting?
Check your spam/junk folder first. If not there, the email may have been quarantined by AppRiver. You can access the quarantine portal to review and release legitimate emails. Contact support if you need help accessing the portal or allowlisting a sender.
How do I send an encrypted email?
Add [SECURE] to your email subject line to trigger automatic encryption. The recipient will receive a link to access the secure message. This is required when sending sensitive information like financial data or personal information outside your organization.

Need More Help?

Our support team is ready to assist you with any questions about our services or policies.

Contact SupportCall (949) 243-7440