Inconsistent output of Site title with special characters on email

[kishanjasani]

The characters in the email are showing inconsistently when a user receives an email from his registration Or While getting the registration Link.

To Reproduce:

1. Add French Word in the Site Title. like Femnøise àèîôû
2. In Admin, Go to User's tag -> click on Send password reset.
3. Check the mail of that user.

I getting Inconsistent output in Gmail. But it shows correct text on yahoo mail.

[nofearinc]

Hey @kishanjasani, thanks for reporting this!

Upon running a local test, it appears that encoding is fine on a local setup (see the second attachment).

It may be an encoding problem with your SMTP server or some local browser settings/extensions interfering with rendering.

[kishanjasani]

Hi @nofearinc,

Encoding is working with Yahoo Mail. But in Gmail, I faced the issue. Not sure, But it shouldn't be an issue with SMTP As It's working on Yahoo mail.

[r1k0]

Reproduction Report

Description

This report validates whether the issue can be reproduced.

Environment

• WordPress: 6.9
• PHP: 8.3.19
• Server: Apache
• Database: mysqli (Server: 11.4.9-MariaDB / Client: mysqlnd 8.3.21)
• Browser: Chrome 143.0.0.0
• OS: Windows 10/11
• Theme: Twenty Twenty-Four 1.4
• MU Plugins: None activated
• Plugins:
  • Test Reports 1.2.1

Actual Results

1. ❌ Error condition doesn't occur (not reproduced).
2. Output of the Site Name in Gmail as it appears in the Site Title input field in Settings > General page.
3. Site title output is consistent in both Gmail and Yahoo mail.

Additional Notes

• None

Supplemental Artifacts

Yahoo output:

Gmail output: