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n your admin console, go to“Filtering rules” and then to“Black list“.

User blacklist
If you blacklist an address or domain, mail from that address or domain to your account will be blocked before it reaches your inbox.
a sender cannot be whitelisted and blacklisted at the same time. Any sender you want to add to the black list when it is also on the white list is automatically removed from the latter.
To add a whitelist or blacklist entry, enter the domain or e-mail address you wish to authorize or block, then click on the Add button.
The address must be in the form utilisateur@exemple.com (to authorize/block mail sent by this user to your account) or example.com (to authorize/block all mail sent by this domain to your account).
To delete entries from a list, click on the Delete link corresponding to the e-mail address or domain concerned.
To import whitelists or blacklists from a text file, create a text file containing all whitelist or blacklist entries, with 1 e-mail address or domain (preceded by the “@” sign) per line.
For example:
john@example.com
jane@example.com
@ foobar.com
All lines starting with a ‘#’ or ‘;’ character will be treated as a comment and ignored.