NetGuard vs Postgrey
A side-by-side look at NetGuard and Postgrey. For an in-depth review of either product, follow the links below.
NetGuard
Security & Privacy
NetGuard is an open source firewall app for Android that blocks connections to the internet based on rules you define. It helps protect your privacy and security by restricting what apps can access the network.
firewallprivacysecurityinternet-access-control
Postgrey
Network & Admin
Postgrey is an SMTP proxy program that temporarily delays mail delivery to help mitigate spam. It uses greylisting to reject initial email delivery attempts, forcing email servers to retry sending messages and confirming they are not spammers.
greylistingsmtpemail-deliveryantispam
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