[exim] Another strange log about tainting

I get these:

Dec 10 11:49:07 ahiker exim: 2019-12-10 11:49:07 1ielVK-00047P-Ll DKIM: validation error: error:04091068:rsa routines:int_rsa_verify:bad signature
Dec 10 11:49:07 ahiker exim: 2019-12-10 11:49:07 1ielVK-00047P-Ll attempt to expand tainted string '${exim_version}'
--
Dec 10 11:50:19 ahiker exim: 2019-12-10 11:50:19 1ielWV-00047R-73 DKIM: validation error: error:04091068:rsa routines:int_rsa_verify:bad signature
Dec 10 11:50:19 ahiker exim: 2019-12-10 11:50:19 1ielWV-00047R-73 attempt to expand tainted string '${exim_version}'
--
Dec 10 11:53:24 ahiker exim: 2019-12-10 11:53:24 1ielZU-00047W-4z DKIM: validation error: error:04091068:rsa routines:int_rsa_verify:bad signature
Dec 10 11:53:25 ahiker exim: 2019-12-10 11:53:25 1ielZU-00047W-4z attempt to expand tainted string '${exim_version}'
--
Dec 10 12:02:41 ahiker exim: 2019-12-10 12:02:41 1ieliT-00047e-DK DKIM: validation error: error:04091068:rsa routines:int_rsa_verify:bad signature
Dec 10 12:02:44 ahiker exim: 2019-12-10 12:02:44 1ieliT-00047e-DK attempt to expand tainted string '${exim_version}'
--
Dec 10 12:30:37 ahiker exim: 2019-12-10 12:30:37 1iem9U-00049d-TP DKIM: validation error: error:04091068:rsa routines:int_rsa_verify:bad signature
Dec 10 12:30:38 ahiker exim: 2019-12-10 12:30:38 1iem9U-00049d-TP attempt to expand tainted string '${exim_version}'

The thing is ${exim_version} doesn't even occur in my configfile ...

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