Symbiosis: Exim "Warning: purging the environment" error on restart
Imported from https://www.github.com/BytemarkHosting/symbiosis/issues/114
Exim prints the following warning message whenever the service is restarted:
Jun 18 14:12:19 symbiosis2.default.aladlow.uk0.bigv.io exim4[573]: Starting MTA:2018-06-18 14:12:19 Warning: purging the environment.
Jun 18 14:12:19 symbiosis2.default.aladlow.uk0.bigv.io exim4[573]: Suggested action: use keep_environment.
This message is fairly harmless but can cause emails to be generated from cron.daily, for example:
/etc/cron.daily/exim4-base:
LOG: MAIN
Warning: purging the environment.
Suggested action: use keep_environment.The solution should be to set keep_environment = in Exim's configuration.
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