![]() That will give the hackers less freedom for spoofing the message origin. Impose "'From' Address Restrictions" and "'From' Name Restrictions" in Outgoing Mail Transfer Settings.That will reduce the rate a hacker will be able to send messages. ![]() Impose tighter limits for "Outgoing Mail Limit", "Outgoing Recipients Limit" and "Max Recipients per Message" in Outgoing Mail Transfer Settings.To reduce the damage caused by compromised Accounts, and to make them to be less attractive for hackers: Enable the Hide 'Account Unknown' messages to hinder address harvesting.Temporarily Blocked IP Addresses in Settings->Network->"Blacklisted IPs" page."Failed Logins Limit" in the Account Settings page.Force Two-factor Authentication, if possible.Force users to have enough long and complex passwords which cannot be guessed easily. ![]() That will prevent hackers from learning passwords via network sniffers.
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