On 11/24/2017 12:39 PM, Andreas Schamanek wrote:

Upgrade SA and that should fix it.

My servers run Debian 8 with SA 3.4.0 + perl 5.20. I still get

Nov 24 06:47:41.209 [12603] warn: Use of uninitialized value in regexp
compilation at /etc/spamassassin/HashBL.pm line 52.

Is 3.4.1 the minimum?

Yep
It requires "registryboundaries" which was introduced in 3.4.1

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