I've found a defect in JSM where I cannot add a customer with a completely valid email address - Jira baulks at <name>@<domain>.org.uk
Having just gone through the process of adding all our customers, this is the only one which has failed, so I'm surmising that the problem is it doesn't recognise .org.uk as a valid TLD (which it is), so this is a bug. However, being on the free tier of use I can't report this as such.
Does anyone have any workarounds?