Issue Summary

This is reproducible : (yes) 

Steps to Reproduce

1. Navigate to any page in Confluence and hit edit
2. In the editor click on the links button and type in a custom domain email address i.e test@test.one
3. Pressing enter should update the link but it doesn't.

Expected Results

Custom domain email addresses should be updated.

Actual Results

The window does not update the email ID.

Workaround

Currently the workaround is to update the email ID in the link in the following format - user1@test.one?subject=Here%20is%20the%20subject&body=Test%20Body