Fixed
- Removed black outline when clicking on links in Chrome.
- Disabled support of legacy attachment URLs with MD5 tokens (GHSA-89ww-mfww-5vr6)
- Fixed linking messages into conversations in Outlook (#4922)
- Take into account IPv6 transition addresses in
Helper::sanitizeRemoteUrl()(GHSA-v5xm-qw3f-qm98) - Fixed preserving CSS custom properties during minification (#5611)
- Fixed emails sometimes being sent as raw MIME source when sending via mail() function (#5615)