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. Using (BerkeleyPacketFilter filter = communicator.This protocol is widely use to send e-Mail from the authors mail program to the mail server and between servers too. (Simply it crashes the interpreter since the string is not recognised) using (PacketCommunicator communicator = selectedDevice.Open(65536, PacketDeviceOpenAttributes.None, 1000))
Sadly, i can't find anywhere the equivalent, and dtls is not recognised in the C# app, and so doesn't grab any packet anymore. Now, i wanted to do the same using C# and PcapDOTNet wrapper that uses WinPcap filters. ( Data Transport Layer Security which is some UDP TLS protocol) I used to filter packets into Wireshark with the simple dtls argument as filter.
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