It is one of the most widely used packet analyzers around because it provides a raw level of detail that solutions like TCP Flow don’t provide. TCP Dump is an open source network packet analyzer (licensed under a 3-clause BSD license) which, in conjunction with the libpcap library, can also be used for capturing network traffic. Now that we’ve gone over SMTP conversation basics and getting the easiest to decipher bits of a TCP conversation with TCP Flow, let’s look at all the information contained in a TCP conversation using TCP Dump and Wireshark. We’ve finally reached the conclusion of our deep dive into how you can capture SMTP conversations should you need to debug an issue that lies deeper than your application.
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