There is a small problem with the email reminder system.
Email received 29 July 2016 11:30…
Your certificate (or certificates) for the names listed below will expire in 10 days (on 08 Aug 16 16:17 +0000). Please make sure to renew your certificate before then, or visitors to your website will encounter errors.
Renewed Manually on same day (Plesk extension)
Serial Number: 03:17:BB:66:42:47:BA:4A:2B:E4:7C:0C:A5:CF:1A:9B:F9:BA
Begins: 29 July 2016
Expires: 27 October 2016
Email received 4 August 2016 15:43…
Your certificate (or certificates) for the names listed below will expire in 4 days (on 08 Aug 16 16:17 +0000). Please make sure to renew your certificate before then, or visitors to your website will encounter errors.
Checked - valid certificate still in place.
If anyone from Let’s Encrypt wants more information please feel free to ask - hopefully my serial number will help you.
You have previously requested a certificate (serial 03:d2:bc:dc:38:a6:3e:b1:4c:1f:a0:7e:65:a2:e3:dc:43:27) only containing your base domain (no www.), and then another one including www. (serial 03:c4:bb:8a:7b:fc:0e:0d:53:a8:53:8c:23:a0:9c:5a:3a:e2). The renewal message you’re receiving is for the one without www..
Let’s Encrypt treats each combination of FQDNs separately when it comes to renewal (because it doesn’t actually check which certificate you’re using, and thus can’ be certain whether it’s a replacement or just a separate certificate). This will happen whenever you add additional domains to the same certificate.