Automatically clean malicious and problematic code to protect your email reputation and deliverability.
Campaign Cleaner's HTML sanitizer removes unsafe tags, scripts, deprecated elements, and non-compliant attributes from your email code - so it renders cleanly across every client and won't trip spam filters.
Quick Overview of Features
Email HTML sanitization is the process of scanning your email's HTML source code and removing or neutralizing elements that are unsafe, deprecated, or non-compliant with email standards. This includes JavaScript, event handler attributes, iframes, object tags, form elements, and any code patterns that spam filters associate with phishing or malicious email campaigns.
Unlike a website where dynamic code is expected, email is a static medium. Any code that tries to execute scripts, load external resources dynamically, or collect user input is out of place in email and is treated with suspicion by both email clients and spam filtering systems. Sanitizing your HTML before sending removes these red flags before they can affect your deliverability.
A thorough HTML sanitizer targets several categories of problematic code. Script tags and JavaScript event handlers like onclick, onload, and onmouseover are removed since email clients block them and spam filters penalize them. Deprecated HTML tags like font, center, and marquee are cleaned up since they produce inconsistent results in modern clients. Non-compliant attributes that violate email HTML standards are stripped, and any external resource references that try to load content from untrusted sources are flagged and removed.
Spam filters look for code patterns that have historically been used in phishing attacks and malicious campaigns. Script tags, hidden form elements, base href redirects, and iframe embeds are all associated with email-based attacks. Even if your use of these elements is unintentional - for example, pasted in from a web-based template editor - the spam filter has no way to know that. It sees the pattern and applies a penalty.
Email clients like Gmail and Outlook don't just ignore unsafe HTML - they actively strip it during rendering, sometimes in ways that damage your surrounding layout. A script tag removed mid-table can collapse a column. An iframe stripped from a layout section can create a gap or trigger a broken layout cascade. Sanitizing before sending means the removal happens cleanly on your terms, not destructively inside the client.
Campaign Cleaner parses your complete email HTML and runs it through a sanitization ruleset covering unsafe tags, non-compliant attributes, deprecated elements, and known spam-trigger patterns. Each flagged element is either removed cleanly or replaced with a safe equivalent. The result is an email that passes spam filter checks and renders consistently across Gmail, Outlook, Apple Mail, and every other major client.
Are You Ready To Experience The Difference?
Become a part of the Campaign Cleaner community today, and join countless satisfied customers who have witnessed significant improvements in their email deliverability and campaign success. Don't let HTML issues hold you back; let Campaign Cleaner optimize your campaigns and boost your inbox rates.
