As the title states - how do you disable the customer signup email but still allow customers to send emails into project and create tickets?
All answers above do not answer question.
You must have the "allow anyone can email requests" turned on for any emails to come through. When this is turned on, new customers who email in, STILL receive the sign up option in which WE do not want. How can you turn off the sign up option but retain the "anyone can email".
In short, all we want is the ability to email requests into projects and not have anyone signup for portal access.
JIRA Enterprise Mail Handler can do this. It can do all sorts of trickery, so it's a great add-on to have if you are doing email intake in to JIRA. A common approach we've used for a number of clients is to create a custom field called "Customer Email Address" or something similar. Only put it on the View screen of the related Projects. Then configure JEMH to populate that field with the email sender address and to open issues as a generic user. You can use that custom field to send out alerts and other things.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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