Note: from Core Update 182 released
New Default Policy: Blocking Email Spammers
This release introduces a change in the default firewall policy for new installations: This new rule blocks outgoing SMTP traffic from internal networks by default. We have recently seen some installations have infected systems and send out large amounts of spam, resulting in unhappy consequences like having your firewall appear on blocklists and trouble logging into online banking.
We believe this change to block outgoing connections on port 25 (TCP) will stop this problem as that port is only used for mailserver-to-mailserver communication. Most user client systems use Submission on port 578 or 465 and therefore this change should not cause any problems is it will block port 25 spam on the Internet.
This update can be easily disabled by remove the checkmark to the left of the pencil icon.
Note: Existing installations will not see any changes. Only a new build starting with Core Update 182.
