symfony/mime v6.4.0-BETA1

on PHP Packagist

Changelog (v6.3.6...v6.4.0-BETA1)

• feature symfony/symfony#51926 [Mime] Forbid messages that are generators to be used more than once (@fabpot)
• feature symfony/symfony#51601 [Mime] Allow to add some headers as a strings (@Oipnet)
• feature symfony/symfony#51191 [Mime] Update mimetypes (@fabpot)
• feature symfony/symfony#50200 [Mailer] Adds assertEmailSubjectContains and assertEmailSubjectNotContains methods (@johanadivare)
• feature symfony/symfony#50842 Add missing return types to magic methods (@wouterj)