Downloading specific mails using POP3 protocol.

[kremuwa]

Hello there,

You probably know that peer2mail clients are connecting to mailboxes, and then they are downloading small parts (5-20 MB) of uploaded file. After they end this process, they merge these parts, called "segments". Each segment is in one mail, as an attachment. And now the most important part: segments have their numbers, from 1 to X; such a number is usually placed in mail's subject. The peer2mail clients are downloading the segments starting with the first and ending on last one. My question is: how to do that using POP3 protocol? Is it possible?

Thank you in advance for your questions for details .

[squidge]

Connect to server, authenticate. Send STAT to check for messages, If messages available send LIST, ignore messages that are too short and place the rest in a queue.
Send TOP to retrieve header for each message. Remove the ones from the queue which don't have valid Subject.
Now use RETR on the rest to retrieve your segments.
Use DELE to delete messages, ensure to delete backwards to keep server message order.
QUIT from server.
Decode saved messages to disk.