What can I check if I get an smrsh 554 service unavailable error when using procmail, mailman, or another program with Sendmail?

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If you have created a .forward file in a user's home directory to forward mail to procmail or created a Sendmail alias to a program such as mailman, you may find email bouncing with the following error in the bounced email:

smrsh: "procmail" not available for sendmail programs (stat failed)
554 5.0.0 Service unavailable

This...

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