March 2018
Intermediate to advanced
626 pages
17h 32m
English
As with IMAP, POP3 uses response messages to signal any failure between the client and server. POP3 primarily uses +OK and -ERR as response indicators, with additional details about the response:

The preceding screenshot is an example where the Response indicator is -ERR and the description carries what type of ERR it is. In this case, ERR is related to login failure.
By using pop.request or pop.response, we can filter the packets based on POP3 request from client to server or the response from server to client, respectively. We can further use the indicator to filter based on specific response indicator:
As shown here, the filter for ...
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