How are emails handled when Public Signup is turned off

[Tom Lister]

We want to disable public signup as it creates a lot on new internal accounts in our system.

We would prefer to only deal with registered users.

What then happens to email from new users? Are they silently ignored.

In our non-JSM mail handlers we can see messages in the logs where users without permissions have been refused.

Ideally we would send an email saying they should contact their account manager or local IT team to help first.