PluginMail fails with System error
PluginMail sometimes ends with an error message like
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System error. The following error message was returned: The query was: select `email` from `users_users` where `userId` in (?,?,?,?,?,?,?) Values: 1. 8 2. 9 3. 6 4. 7 5. 10 6. 11 7. 1 The built query was likely: select `email` from `users_users` where `userId` in ('8','9','6','7','10','11','1')
This occurs for instance if the address list contains two groups with users being members of both groups.
Workarounds are discussed in Wishes and Bugs: Item 6429
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