There have been numerous posts on this forum about the fact that you can’t use ANY email address from any domain as the userid.
IE if we are “www.whoever.com” & we want to allow access to “fredblogs@hotmail.com” we can’t… because @signs are disallowed & this user id would be truncated to “fredblogs”, which would effectively be fredbloggs@whoever.com
Does this problem still exist in R7