Username alias

[rcUSERNAME]

I have what I think should be an easy question, but I can't seem to work it out.

I am using roundcube to login to a remote mailserver hosting a single domain.  This works fine, but the username used for IMAP authentication (and hence login to roundcube) is long and not very informative.  It would be good to use a shorter alias to this name to login to roundcube and have it authenticate with the "correct" username. 

For example, if I want to login to longAnnoyingEmailAddress@remoteImapServer.com, I would prefer to simply type something like "shortAlias" into the username box rather than "longAnnoyingEmailAddress".

I thought the virtuser_file plugin did this, but having installed it, I think it does something else.

Any suggestions?

[rcUSERNAME]

For anyone else with the same problem you can enable the option $rcmail_config['user_aliases'] = true; in your main config file.  This will allow you to login with any identity associated with an account which is close enough to what I wanted.