Issue when updating customer email in Admin Panel with ö and .swiss domain

[ouwfuc]

Preconditions and environment

Magento versions tested:

• 2.4.5-p10
• 2.4.6-p7
• 2.4.7

Steps to reproduce

1. Go to the Admin Panel.
2. Navigate to Customers > All Customers and select a customer.
3. In the Account Information section, try to update the email address to something like max@möstermann.swiss.
4. Save the changes.

Expected result

Email address and customer saved successfully

Actual result

After attempting to save the email, the following error message is displayed at the top of the page:

• "Email" is not a valid hostname.
• 'xn--mstermann-07a.swiss' looks like a DNS hostname but we cannot match it against the hostname schema for TLD 'swiss'.
• 'xn--mstermann-07a.swiss' looks like a local network name, which is not an acceptable format.

Additional information

Observations:

• When I enter an email like max@möstermann.com, it works fine.
• When I enter max@möstermann.swiss with the ö, the email is converted to its Punycode equivalent (xn--mstermann-07a.swiss), and the error is triggered.
• I tried .swiss by itself without the special character ö (e.g., `max@mail.swiss) and it works fine.

It seems like the combination of the ö character and .swiss is causing the issue. The email address gets converted to Punycode, but it seems Magento or the underlying validation logic doesn't handle this combination correctly.

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @ouwfuc. Thank you for your report.
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[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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[engcom-Delta]

Hi @ouwfuc ,

Thanks for your reporting and collaboration.
We have verified the issue in Latest 2.4-develop instance and the issue is reproducible. Kindly refer the screenshots.

Steps to reproduce

1. Go to the Admin Panel.
2. Navigate to Customers > All Customers and select a customer.
3. In the Account Information section, try to update the email address to something like max@möstermann.swiss.
4. Save the changes.
5. After attempting to save the email, the following error message is displayed at the top of the page:

"Email" is not a valid hostname.
'xn--mstermann-07a.swiss' looks like a DNS hostname but we cannot match it against the hostname schema for TLD 'swiss'.
'xn--mstermann-07a.swiss' looks like a local network name, which is not an acceptable format.

Thanks.