if you want to avoid manual editing of an individual .procmailrc to be deleted by templates
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By design the mail user .procmailrc file is built from SME templates whenever a system update is performed. You can disable that action by enabling "geekmode", using the command below. With that done, you may write your own .procmailrc file and place it in the appropriate mail directory.
db accounts setprop USERNAME geekmode enabled
db accounts setprop USERNAME geekmode enabled
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Geekmode implies you know what you are doing when creating a custom .procmailrc file.