EAI TOOLS
EAI compatibility
Check international email support.
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What does this tool do?
Email Address Internationalization (EAI) enables email addresses containing non-ASCII characters, including in the local part before @.
Why is it useful?
Testing compatibility helps identify systems that may reject valid international addresses, making services more inclusive.
How to use it
- Enter an address using a domain you control or are authorized to test.
- Review the reported server capabilities and test outcomes.
- Test registration, storage, sending and receiving across each application in your workflow.
What the result can and cannot tell you
These checks cover at most three MX hosts. A TLS certificate check covers the current connection only. Server capabilities do not prove that a full delivery path or every application supports EAI.