Mailster v1.8.1 runs on Joomla 3, 4 and 5.

Here is the overview of the changes in this release:

Improvements

• Improve styling in Joomla 5
• Shorten (too) long subjects to the current max. length: 191 characters
• Issue warning when Mailster system plugin (Email Forwarder) has access level not set to Public
• Improve cronjob execution to bail if not all prerequisites are given
• Add selected logging about queue status and actions

Fixes

• Servers can be published/unpublished/deleted again
• Make the Mailster system plugin more resilient
• Remove unneeded Joomla 2.5 style params in config XMLs
• Remove connection check
• Change toward general Exception-catching