On this tab, end users can blacklist email senders, so the messages from them are always regarded as spam and therefore will be quarantined.
Note – The Sender Blacklist tab is only available if the users' email address belongs to the network or domain monitored by Sophos UTM, and an administrator assigned them access rights to the feature.
The blacklist is applied to both SMTP and POP3 email, if these are in use on the system. Blacklisted senders can be specified by clicking the Plus icon, entering the address and clicking the Tick icon to save it. Users can either enter valid email addresses (e.g., email@example.com) or all email addresses of a specific domain using an asterisk as wildcard (e.g., *@example.com). Sender whitelist and sender blacklist can be used in combination: Users can for example blacklist an entire domain (e.g., *@hotmail.com) but whitelist specific email addresses belonging to this domain (e.g., firstname.lastname@example.org). If the exact email address is listed on both, whitelist and blacklist, the address is blacklisted.
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