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To explicitly specify the PATH, you may need to include the path portion in double quotes (e.g. In order for the system to find dumpcap, you will need to include it as part of the Windows PATH environment variable, or explicitly specify the path. It resides in the Wireshark root folder (e.g. To capture Wireshark data, you will need to use “dumpcap” which is a command line utility installed as part of Wireshark. However, if you know the TCP port used (see above), you can filter on that one.How to use Wireshark (on Windows) to capture a driver or network issue that may only occur very infrequently, for example, to capture data on an issue which may occur only once a month. You cannot directly filter SMTP protocols while capturing. Show only the SMTP based traffic with the "MAIL FROM" command: contains "FROM" Display FilterĪ complete list of SMTP display filter fields can be found in the display filter reference Keep it short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.

XXX - Add a simple example capture file to the SampleCaptures page and link from here. (XXX add links to preference settings affecting how SMTP is dissected). XXX - Add example traffic here (as plain text or Wireshark screenshot). SMTP uses MIME_multipart to transfer attachments The well known TCP port for SMTP traffic is 25. TCP: Typically, SMTP uses TCP as its transport protocol. SMTP is existing since the early days of the internet and was one of the first protocols used. Receiving mail from a server - on the other hand - is done using POP or IMAP. This protocol is widely use to send e-Mail from the authors mail program to the mail server and between servers too.