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Re:Chrome 68 will mark all HTTP sites as “not secure” by jacobparker on Thursday February 08, 2018 @04:04PM (#16335588)
The email doesn't come from your server, it comes from Lets Encrypt.

https://letsencrypt.org/docs/expiration-emails/

Re:Chrome 68 will mark all HTTP sites as “not secure” by TeMPOraL on Thursday February 08, 2018 @04:06PM (#16335598)
Ah, ok. I read "they" as "cron jobs".