Issue Horde / Roundcube forwarding hack

[tkalfaoglu]

Both webmails allow mail to be CC'ed to somewhere else, without the customer noticing the carbon copying. I was wondering if there was a guide to DISABLE forwarding/CC'ing via the webmail interfaces. Over the years I found many such forwards -- usually being noticed by the customer when the forward address mail (usually some free email address) was deleted and the bounces started coming to the customer