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If all else fails, just convert the entire DB to text using this tool: http://spamassassin.taint.org/devel/db-to-text.pl.txt , and it's "-o" switch, and convert from text into the DB_File DB format on the other side using the same tool and the "-i" switch.
DB 1.8.5 to DB 4.2.x
db_load and db_dump as documented above are mostly useful for close versions. Converting between more dissimilar versions requires a little more work. To go from 1.8.5 to 4.2.x, you need to dump using the db_dump185 tool which is included in the tarball for 4.2.x but isn't always built. To build it, download and extract the tarball and then do this:
| No Format |
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cd build_unix/
../dist/configure --enable-dump185
make
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Of course, this will fail if you don't have the libs for 1.8.5 around - so build this on the old system, then dump the files, then move the dumps to the new system, and then finally, use db_load as described above to import them.
Other Dbs
You can do the same with the bayes_seen and auto-whitelist files, but they're not as important; I generally just blow them away:
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