Because I don’t know the answers, the marketing guy left and I am left to pick up the pieces. I’m an IT guy and I know nothing about these things.
I received an email from cpanel (vanadium.cloudhosting.co.uk) about the letsencrypt certificate not being able to renew, I just discovered that mail.defrance.co.uk was the problem so I just issued a new certificate but unticked mail.defrance.co.uk and it issued just fine although it only renewed for 3 months, is that normal ? and can I configure it so it always ignores mail.defrance.co.uk so the auto renewal won’t have any problems in future
Yes, the certificates are valid for 90 days and must be renewed. It's suggested that you attempt to renew them at 60 days - in case of any unforeseen problem. Then you'll have time to correct any problems before the current cert expires.