This is really old, but it was never answered satisfactorily and it is what
shows up in a Google search for the problem. I'm posting this solution to make
sure it shows up in future searches.
Here is the solution I just found and added to the Apache SpamAssassin wiki
https://wiki.apache.org/spamassassin/InstallingOnMacHighSierra
I only tested this with perl installed using perlbrew, as that is so much
simpler to use and to install CPAN modules with, but the important part is to
install a current berkeley-db to replace the version 1.x that is now included
with Mac OS X High Sierra. I used homebrew, as in
brew install berkeley-db
Macports install of db48 should work for that, but I haven't tried it.
Once you have a current berkeley-db you can install the CPAN module DB_File
which is what is needed to fix the problem with installing SpamAssassin.
-- sidney
Palvelin Postmaster wrote on 30/01/18 2:43 AM:
I have macOS High Sierra 10.13.3 using SpamAssassin 3.4.1 on Perl 5.24
installed via MacPorts. When running SA with bayes enabled, the bayes.toks
files grow indefinitely until the volume is full.
This thread suggests the issue may only occur on an APFS volume:
https://discussions.apple.com/thread/8203349
Trying to analyze the problem I noticed that the same situation occurs when
running 'make test' for Mail::SpamAssassin the bayesdbm.t. My guess is that
either SpamAssassin's Bayesdbm.pm module or one of it's dependencies is the
culprit.
