Current users of WordPress Mail Queue with an active support and upgrade subscription via Freemius can upgrade via the Plugins page within their blog dashboard.
Version 4.2 contains the following enhancements and bug fixes:
- WordPress 5.5 ready
- Updated WordPress compatibility data in ReadMe file
- Avoid duplicating existing cron intervals
- Define added cron schedules using core PHP time definitions
- Consistency in strings on admin page
- Update wp_mail() functions ready for WordPress 5.5 while maintaining backwards compatibility