1using(IMAP_Client c = new IMAP_Client()){
 2    c.Connect("ivx",143);
 3    c.Authenticate("test","test");
 4
 5    c.SelectFolder("Inbox");
 6
 7    IMAP_SequenceSet sequence_set = new IMAP_SequenceSet();
 8    // First message
 9    sequence_set.Parse("1");
10    // All messages
11//  sequence_set.Parse("1:*");
12    // Messages 1,3,6 and 100 to last
13//  sequence_set.Parse("1,3,6,100:*");
14
15    // Get messages flags and header
16    IMAP_FetchItem msgsInfo = c.FetchMessages(sequence_set,IMAP_FetchItem_Flags.MessageFlags | IMAP_FetchItem_Flags.Header,true,false);
17
18    // Do your suff
19}