Mailster v1.7.6 fixes a few issues.

Improvements

• Improve compatibility with PHP 8
• Introduce dummy-updateservers to please the Joomla 3.10 update checker ("Pre-Update Check for Joomla 4.x")

Fixes

• Servers can be deleted again
• Do not render user view when no user record found
• Digest sending mechanism does not produce PHP warning