Hello,
Your certificate (or certificates) for the names listed below will expire in 1 days (on 22 Jul 16 14:44 +0000). Please make sure to renew your certificate before then, or visitors to your website will encounter errors.
osnabrueck.freifunk.net www.osnabrueck.freifunk.net
For any questions or support, please visit https://community.letsencrypt.org/. Unfortunately, we can't provide support by email.
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Regards, The Let's Encrypt Team