Sourced from phpmailer/phpmailer's releases.

v6.10.0

PHPMailer 6.10.0

This is a feature and maintenance release introducing full support for RFC 6531 SMTPUTF8, meaning that you are now free to use Unicode characters in email addresses, such as JøeÜser@example.com, and everywhere else, without any complicated encoding schemes. Using this feature requires that you send through a mail server that advertises support for SMTPUTF8. For full details see SMTPUTF8.md.

What else changed

• Do not add .editorconfig file to releases by @​ziegenberg in PHPMailer/PHPMailer#3130
• Replace Swiftmailer with Symfony Mailer by @​no-one in PHPMailer/PHPMailer#3132
• Remove a space by @​no-one in PHPMailer/PHPMailer#3133
• Fix the smtp error ErrorInfo msg: Troubleshooting url glued by @​sudwebdesign in PHPMailer/PHPMailer#3148
• Add missing translations and improve grammar for European Portuguese by @​sudojoao in PHPMailer/PHPMailer#3147

New Contributors

• @​ziegenberg made their first contribution in PHPMailer/PHPMailer#3130
• @​no-one made their first contribution in PHPMailer/PHPMailer#3132
• @​sudwebdesign made their first contribution in PHPMailer/PHPMailer#3148
• @​sudojoao made their first contribution in PHPMailer/PHPMailer#3147

Full Changelog: PHPMailer/PHPMailer@v6.9.3...v6.10.0

Sourced from phpmailer/phpmailer's changelog.

Version 6.10.0 (April 24th, 2025)

• Add support for RFC 6530 SMTPUTF8, permitting use of UTF-8 Unicode characters everywhere, thanks to @​arnt and ICANN. See SMTPUTF8.md for details.
• More reliable checking for multibyte support.

• bf74d75 6.10.0
• e932843 Docs
• ca87ef2 Docs
• 80b6275 Skip this test when UTF-8 isn't usable
• c5dae41 Merge branch 'SMTPUTF8-test' into SMTPUTF8
• fc6779f Fail to add an address if it uses 8-bit chars in the domain, but we are missi...
• 154743c nah
• 1ef59a2 Try without mbstring
• 1db5c74 Use existing function to check for test config
• d31cb27 Adjust eai regex to disallow emoji and letters/numbers.
• Additional commits viewable in compare view

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