To all
For future reference this solved my problem:
db accounts set mail user
For future reference to other readers, various accounts have been marked as system accounts and hidden from view for good reasons.
It is NOT WISE to change them and use them as normal accounts, as you may have unforseen ramifications at a later stage.
The pseudonyms panel provides an alternative means of creating "same name" email addresses for different domains that can be directed to different users or the same user.
These can be created to use existing system names or normal user created names.