Got a notification for a domain that I don't know

I got a notification for a domain that I never heard before: osteks.de.

Is that some kind of phishing, or an issue with the letsencrypt-mail service?

Most likely somebody mistyped their email address.

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There have also been situations where there was a bug in some major webhosting software where I believe one of the customers email address was used for all the customers certificate notifications. :roll_eyes:

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