For Redmine 4.x.x.
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Copy the plugin directory into the $REDMINE_ROOT/plugins directory. Please note that plugin's folder name should be "redmine_single_mail".
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Install
e.g. bundle install
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(Re)Start Redmine.
Try this:
- Remove $REDMINE_ROOT/plugins/redmine_single_mail directory.
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Open the 'Administration' -> 'Plugins' -> 'Redmine Single Mail plugin' -> 'Configure' page.
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Check "Send a single mail to multiple addresses"
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Click "Apply" button to save.