See exactly how your subscriber list breaks down across Gmail, Outlook, Yahoo, Apple Mail, and more — then use that data to prioritize your deliverability work.
Campaign Cleaner's MX Vision tool processes your email list and maps every domain to its mailbox provider - giving you a clear breakdown of how your audience distributes across Gmail, Outlook, Yahoo, Apple Mail, and more.
Quick Overview of Features
MX Vision is Campaign Cleaner's email list analysis tool that maps every domain in your subscriber list to its mailbox provider. It performs MX record lookups - querying the DNS mail exchanger records for each unique domain - and groups the results into a clear percentage breakdown showing how your audience distributes across Gmail, Outlook, Yahoo, Apple Mail, and other providers. This gives you a factual, data-driven picture of whose infrastructure your emails must navigate before reaching your subscribers.
The tool works by resolving the MX records of each domain rather than making assumptions based on the domain name itself. A subscriber with an email at a custom business domain may actually have their mail hosted on Google Workspace, Microsoft 365, or another major platform. MX Vision identifies the true underlying provider regardless of the domain name shown, so your breakdown reflects actual infrastructure rather than surface-level guesses.
Every major mailbox provider operates its own spam filtering system, sender reputation framework, and engagement scoring algorithm. What satisfies Gmail's requirements does not automatically satisfy Outlook's, and what Yahoo demands differs from both. Without knowing how your list breaks down, you are optimizing deliverability in the abstract - making improvements that may or may not address the specific systems that most of your subscribers actually use.
Knowing that 70% of your list is on Gmail tells you that Gmail's filtering requirements are the highest-leverage place to focus your pre-send work. Knowing that 30% is on Outlook-hosted business domains tells you that corporate gateway settings and Microsoft's SmartScreen filter deserve dedicated attention. The provider distribution turns deliverability optimization from a generic checklist into a targeted, prioritized action plan based on your actual audience.
Gmail places heavy weight on recipient engagement history. Its machine learning systems track whether recipients open, click, reply to, or delete your messages - and build an individual sender reputation that influences how future messages are classified. A sender with strong engagement history consistently reaches the inbox, while one with low engagement gets progressively demoted to the Promotions tab or spam folder, even if the content itself is clean.
Outlook's SmartScreen filter gives significant weight to sending domain reputation, bulk sender signals, and complaint rates reported through its Junk Email Reporting Program. Yahoo has been one of the most aggressive enforcers of DMARC alignment and was an early adopter of the p=reject policy for its own domains - a stance that signaled its broader commitment to strict authentication. Apple Mail introduced Mail Privacy Protection, which pre-loads email content and obscures open tracking data. Each provider has its own postmaster tools, feedback loop structure, and complaint thresholds that senders need to manage separately.
Provider concentration tells you where a deliverability failure would hurt most. If 65% of your list is on Gmail and your recent campaigns have low open rates with Gmail recipients, a dip in your Gmail sender reputation could suppress delivery to the majority of your audience in a single send. MX Vision makes this risk visible before it becomes a crisis by showing you the weight of each provider in your subscriber base.
A heavily Yahoo-concentrated list tells you to put DMARC compliance at the top of your pre-send checklist. A high proportion of corporate email addresses on Outlook-hosted domains tells you to test your email through Microsoft's filtering stack and ensure your sending IP has good reputation in Microsoft's systems. A large Apple Mail segment tells you that open rate data will be unreliable and that click-based engagement metrics are a more trustworthy signal. The breakdown translates into concrete, provider-specific decisions rather than generic best-practice advice.
MX Vision is designed to run before you build or finalize a campaign. Upload your list, review the provider breakdown, and use it to shape your pre-send checklist - verifying DKIM and DMARC alignment if Yahoo or Google represent a large share, auditing engagement segmentation if Gmail dominates, or evaluating corporate gateway compatibility if Outlook is prominent. The analysis takes minutes and gives you the provider-level context that generic spam score checks do not provide.
The tool pairs directly with Campaign Cleaner's content optimization and HTML cleaning features. You can analyze your audience distribution and clean your email HTML in the same platform, so your pre-send workflow covers both the content your email delivers and the infrastructure it needs to pass through. Understanding both sides of that equation - what your email says and where it needs to go - is the foundation of reliable inbox placement at scale.
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.
