Inside .procmailrc

Important variables in .procmailrc:

MAILDIR — default: $HOME/Mail. You can change this or if you don't want to touch .procmailrc, create an appropriate symlink.

SPAMFOLDER — default: spam.incoming.

BLOCKFOLDER — default: block.incoming.

BULKFOLDER — default: bulk.incoming.

DEFAULT — default: /var/mail/you

ADMINFOLDER — default: admin.incoming.

VIRUSFOLDER — default: /dev/null

SPAMREPLY — default: SILENT. Do not send email to the spammer's upstream service provider nor a MAILER-DAEMON reply to the spammer. See comments in example .procmailrc file.

There are copious comments in .procmailrc if you wish to change any variable.