Deprecation: #62794 - Mail methods in GeneralUtility

See forge#62794

Description

The following methods of the class TYPO3CMSCoreUtilityGeneralUtility have been marked as deprecated:

quoted_printable()
encodeHeader()
substUrlsInPlainText()

Impact

The methods were used together with the old mail API and are now obsolete. Deprecation warnings will be triggered if used.

Affected installations

Installations that still use those methods will trigger deprecations warnings.

Migration

Code that still uses these methods should be refactored to the mail API using TYPO3CMSCoreMailMailer class.