Skip to content
Best Practices

Tackling Outbound Spam: A Guide for Web Hosts

By MailChannels | 3 minute read

Tackling Outbound Spam A Guide For Web Hosts

Outbound spam is more than just a nuisance; it’s a threat to your network’s integrity and your brand’s reputation. When a user’s account is compromised, it can lead to a cascade of problems, including blocked emails, unhappy customers, and a tarnished brand image.

The Main Culprits of Outbound Spam:

  • Compromised Users: Legitimate users whose accounts are hijacked to send spam.
  • Compromised Servers: Computers infected with malware, becoming part of spam-sending botnets.
  • Compromised Applications: Legitimate websites, like WordPress sites, hacked to distribute spam.

The Fallout of Outbound Spam:

Outbound spam can lead to IP blocklists, customer complaints, and a significant increase in support tickets. Nearly 40% of hosting providers have experienced IP blocks in the past year due to spam.

How to Fight Back Against Outbound Spam:

  • Monitor Real-time Blocklists (RBLs): Use tools like RBLmon or MxToolbox to receive alerts when your IPs are listed on an RBL.
  • Monitor Spam Traps: Develop or rent a spam trap network to get alerts about spammy activities.
  • Monitor Your Abuse Address: Use your abuse contact address to receive feedback and take action against bad senders.
  • Set up Feedback Loops (FBLs): Get detailed feedback reports from large email receivers to rapidly address spam issues.

Alternatives for a Cleaner Email Environment

  • Block Port 25: Prevent customers from sending email by default if they don’t need email service.
  • Use a Third-Party SMTP Relay: Services like MailChannels monitor outgoing emails for spam, outsourcing the problem and ensuring smoother email delivery.

How MailChannels Can Help

MailChannels offers a comprehensive solution for web hosting providers, including behavior and reputation analysis, content filtering, and segregated SMTP traffic to ensure clean, legitimate email delivery. By using MailChannels, you can reduce support tickets and increase customer satisfaction.


What is outbound spam?

Outbound spam refers to unsolicited emails sent from your network, typically by compromised user accounts, servers, or applications.

Why is controlling outbound spam important?

Controlling outbound spam is crucial to protect your network’s reputation, prevent your IPs from being blocklisted, and ensure the smooth delivery of legitimate emails.

How can I monitor for outbound spam?

You can monitor for outbound spam by using Real-time Blocklists (RBLs), maintaining a spam trap network, monitoring your abuse contact address, and setting up Feedback Loops (FBLs) with large email receivers.

What are the consequences of not addressing outbound spam?

Failing to address outbound spam can lead to your IPs being blocklisted, increased customer complaints, and a higher volume of support tickets.

How can MailChannels help in controlling outbound spam?

MailChannels provides a comprehensive solution for web hosting providers, including behavior and reputation analysis, content filtering, and segregated SMTP traffic management to ensure the delivery of clean and legitimate emails.

Cut your support tickets and make customers happier