Issue with bogofilter

[Stephen Davies]

I have added bogofilter to amavisd.conf @spam_scanners with:

    ['Bogofilter', 'Amavis::SpamControl::ExtProg', 'bogofilter',
         [ qw(-e -u -v)],
      mail_body_size_limit => 65000, score_factor => 1.0,
    ],


My log now has:

Dec 18 20:16:23 mustang amavis[582094]: (582094-32) (!)Bogofilter 
stderr: BDB0161 unlink: /var/spool/bogofilter/__db.001: Permission 
denied\nBDB0161 unlink: /var/spool/bogofilter/__db.003: Permission 
denied\nBDB0161 unlink: /var/spool/bogofilter/__db.002: Permission 
denied\nBDB0161 unlink: /var/spool/bogofilter/__db.001: Permission 
denied\nBDB0060 PANIC: fatal region error detected; run 
recovery\nbogofilter[629228]: DB_ENV->open, err: -30973, BDB0087 
DB_RUNRECOVERY: Fatal error, run database recovery\n\n### Standard 
recovery failed. ###\n\nPlease check section 3.3 in bogofilter's 
README.db file\nfor help.\n
Dec 18 20:16:23 mustang amavis[582094]: (582094-32) (!)checking with 
spam scanner Bogofilter failed: Bogofilter: error running program 
bogofilter: exit 3
Dec 18 20:16:23 mustang amavis[582094]: (582094-32) (!!)TROUBLE in 
check_mail: spam_scan FAILED: Bogofilter failed: Bogofilter: error 
running program bogofilter: exit 3 at 
/usr/share/perl5/vendor_perl/Amavis/SpamControl.pm line 165.
Dec 18 20:16:23 mustang sendmail[629219]: 5BI9kLfL629219: Milter: data, 
reject=451 4.5.0 Error in processing, id=582094-32, spam_scan FAILED: 
Bogofilter failed: Bogofilter: error running program bogofilter: exit 3 
at /usr/share/perl5/vendor_perl/Amavis/SpamControl.pm line 165.

All of the files in /var/spool/bogofilter look like:

-rw-rw-r--  1 dnsmasq amavis    999424 Dec 18 21:15 __db.001

(No idea where dnsmasq (user 983) comes from.)

What should permissions be?