LuLu is a free macOS app designed to complement macOS' firewall by adding automated blocking capabilities for all outgoing Internet connections. To be more exact, LuLu runs in the background on your Mac and displays an alert as soon as any application tries to make a connection to a remote Internet.
Mail User Guide
Use Server Settings preferences in Mail to change options for an account’s incoming and outgoing (SMTP) mail servers.
Allow Outgoing Connections Firewall
By adding apps to your accept list, they will be automatically allowed when requesting permission to run. To do this: Click the '+' below the incoming connections window. Click the name of an app you'd like to allow. Repeat for as many apps as you like. You can also click the '-' while an app is selected to remove it from your block or accept list. LuLu is a free macOS app designed to complement macOS' firewall by adding automated blocking capabilities for all outgoing Internet connections. To be more exact, LuLu runs in the background on your Mac and displays an alert as soon as any application tries to make a connection to a remote Internet. Click the Apple menu (upper left corner of your screen) System Preferences Internet Accounts. Select the account with the broken outgoing mail server, and then click the minus sign at the bottom. Reboot your Mac. Click the Apple menu System Preferences Internet Accounts. Click Google, and sign into your Gmail based account again. Little Snitch is a popular Mac app that detects outbound connections and lets you set up rules to block those connections. Once installed, Little Snitch monitors your internet traffic and every time it detects an outbound connection, for example, Adobe Reader trying to access the internet, it pops up a window and ask you if you want to allow the connection one time, or make a rule to allow.
To change these preferences in the Mail app on your Mac, choose Mail > Preferences, click Accounts, then click Server Settings.
Note: The settings you see vary depending on your account type.
Incoming mail server settings
Outgoing mail server (SMTP) settings
Check Outgoing Connections
If you change settings, click Save to save your changes.
Mac Firewall Block Outgoing Connections
See alsoChange Outgoing server settings in Mail on Mac
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