What happens to existing users @domain1.com when the domain is removed from approved domains?

[Deleted user]

We have added a new verified domain added, let us call it Domain2.com and have renamed most users accounts from user@domain1.com to user@domain2.com. Some are still trying to use their old accounts to log in therefore new duplicate accounts are being created: user@domain1.com. 

We want to prevent @domain1.com accounts from being created, but still, allow existing @domain1.com accounts to work until we change them. 

Can Domain1.com be removed from Approved domains under Site Access, without affecting Domain1.com users? 

[John Funk · Accepted solution]

Hi Sham,

Have you already implemented Atlassian Access? Or just preparing for it? 

Prior to having Atlassian Access we were able to remove an approved domain with no impacts on the users. 

[Dave Meyer]

This is correct. Removing an approved domain will simply prevent new users on @domain1.com from joining the site, it won't have impact on any existing users. I think this is what you want.

[Deleted user]

This is a late reply. 
Thanks John and  Dave - it can be removed with no impact - confirmed

Not implementing Atlassian Access.