With a portal lock [1] a user can be disabled for a certain portal.
Log in at this portal is still possible, however parts generation is not possible.
Thus the behaviour is according to the one of an email exclusion. On this see under Section 1.2, “Manage email exclusion/inclusion lists”.
In contrary to the complete disabling of a user (compare Section 1.1.4.2, “Enable and disable users”) a portal lock only applies for the stated portal and not for all portals.
If a user is locked for a portal, always a reason has to be stated, in order for the portal lock to be understandable later (e.g. competitor, mass downloader).
The following actions are available for portal lock management. Click on the link, in order to reach the respective section.
[1] A portal lock works independent from the email address. With email exclusions complete domains can be locked.