I need the account authentication email from a specific domain to be blocked at a certain time during the day. This is to prevent users from using the email accounts outside of working hours.
This feature isn't in the software at all (to my knowledge!) with no plans for it.
Out of curiosity, how do your users access their email? (e.g. via Webmail, POP3 or IMAP)
If they only access their emails via webmail, you could build an email inbox script so that logon is restricted at certain times. Wouldn't be too hard using PHP: date().
One workaround that comes to mind would be to setup a script that modifies the password entries in the shadow file associated with their email accounts at a certain time and then reverts them back to the original entries after that time period. Feel free to submit a feature request for this functionality via: