Block lists

import { GlossaryTooltip } from "~/components";
When you add blocked senders, Email security automatically marks all messages from these senders with a 
MALICIOUS disposition.
Add a blocked sender
To create a new blocked pattern:
Log in to the Email security dashboard.
Go to Settings (the gear icon).
On Email Configuration, go to Block List > Blocked Senders.
Select + New Sender.
Enter the pattern information:
Sender: Enter one of the following types of pattern:
Email addresses: Must be a valid email.
IP addresses: Can only be IPv4. IPv6 and CIDR are invalid entries.
Regular expressions: Must be valid Java expressions. Regular expressions are matched with fields related to the sender email address (
envelope from, 
header from, 
reply-to), the originating IP address, and the server name for the email.
Notes: Provide additional notes about the blocked sender pattern.
Select Save.
CSV uploads
You can also upload a CSV file of multiple allowed patterns. The CSV file must be smaller than 150 KB, start with a header row of all required values, and contain no additional fields.
An example file would look like this:
Blocked_Sender, Notes
john.smith@email.com, John Smith
melanie.turner@email.com, Melanie Turner