Frequently Asked Questions

What is the Alias Compatibility Checker?

The Alias Compatibility Checker reports known alias support or blocking rules (e.g., "+ addressing", disposable domains) for popular sites.

How up-to-date is your database?

Our community-updated database is reviewed monthly to include new findings on alias acceptance and blocking behaviors.

Which alias formats are checked?

We check plus addressing ("user+tag@example.com"), disposable domains, sub-addressing, and other common alias schemes.

Can I request a site to be tested?

Yes, you can submit requests via our feedback form. We’ll research and update the compatibility entry.

Is this tool free to use?

Completely free—no registration required. Use it to avoid alias signup headaches.

How accurate are the results?

Based on community reports and manual testing. We list confidence levels for each site entry.

What if I disagree with a result?

Submit a correction via our feedback form; we’ll review and update within 24–48 hours.

Can I embed this on my site?

Yes—contact us for an API key and embed code to integrate into your internal tools.

Where can I see the full list?

A complete compatibility matrix is available on our GitHub repository, linked in the footer.

How can IT teams use this?

Embed our API or share links to ensure alias support policies are known before provisioning accounts.