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Tracking is everywhere on the Internet. Over the past year, a drumbeat of tech-industry scandals has acclimated users to the sheer number of ways that personal information can be collected and leaked.
I confess, I'm an outlaw at heart. I like using packet sniffers like tcpdump because it satisfies my base snooping impulses. Packet-sniffing is wiretapping after all, only it's applied to TCP/IP packets, not voice transmissions. Sure, they're my packets on my systems, but still the idea is appealing. Did you know that you can use tcpdump to verify that encryption on your POP email server is working? Find out how in this informative tutorial from Carla Schroder.
In the event that a message is wrong, a sender isn't real or any number of other problems, dealing with bounced messages is a pretty important part of email servers... If you're using Postfix for your email needs... This guide shows how to configure custom Postfix bounce messages.
