(C#) Examine Junk/NonJunk Flags on Outlook.com and GMail

Examines the Junk and NonJunk FLAGS for IMAP on Outlook.com and GMail.com.

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Chilkat.Imap imap = new Chilkat.Imap();

// This example assumes Chilkat Imap to have been previously unlocked.
// See Unlock Imap for sample code.

// Connect to the outlook.com IMAP server.
// We'll do the same for GMail below..
// Use TLS
imap.Ssl = true;
imap.Port = 993;
bool success = imap.Connect("imap-mail.outlook.com");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Login
success = imap.Login("myAccount@outlook.com","OUTLOOK_PASSWORD");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Begin keeping a log of the session here.
imap.KeepSessionLog = true;

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// The LastResponse property contains the full response of the last command.
// The response to the SELECT mailbox command shows the FLAGS that can be set
// for emails in the mailbox.
string selectResponse = imap.LastResponse;
Debug.WriteLine(selectResponse);

// The response to "SELECT Inbox" looks like this:
// There are no FLAGS for Junk/NonJunk..

// * 4 EXISTS
// * 0 RECENT
// * FLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)
// * OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)] Permanent flags
// * OK [UIDVALIDITY 14] UIDVALIDITY value
// * OK [UIDNEXT 1719] The next unique identifier value
// aaac OK [READ-WRITE] SELECT completed.

// Fetch the flags for each message in the mailbox.
// Prior to running this example, (using Mozilla Thunderbird) I marked one of the emails
// in my outlook.com Inbox as Junk.  
int sequenceNum = 1;
while (sequenceNum <= imap.NumMessages) {
    string flags = imap.FetchFlags(sequenceNum,false);
    Debug.WriteLine(Convert.ToString(sequenceNum) + ": " + flags);
    sequenceNum = sequenceNum + 1;
}

// The output of the above loop is this:

// 	1: \Seen
// 	2: \Seen
// 	3: \Seen
// 	4: \Seen

// As you can see, nothing is marked as Junk/Spam.  This concurs with the list of FLAGS
// documented in the response to the SELECT command.  Apparently, there is no flag for junk/nonjunk
// for outlook.com.  Mozilla Thunderbird must be storing additional information about particular
// emails locally.  (In other words, perhaps the Junk/NonJunk flag is information stored locally 
// by Thunderbird, and is not a flag set on the server.)

Debug.WriteLine("---- Session Log ----");
Debug.WriteLine(imap.SessionLog);

// The session log looks like this:

// 	----IMAP REQUEST----
// 	aaac SELECT "Inbox"
// 	----IMAP RESPONSE----
// 	* 4 EXISTS
// 	* 0 RECENT
// 	* FLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)
// 	* OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)] Permanent flags
// 	* OK [UIDVALIDITY 14] UIDVALIDITY value
// 	* OK [UIDNEXT 1719] The next unique identifier value
// 	aaac OK [READ-WRITE] SELECT completed.
// 	----IMAP REQUEST----
// 	aaad FETCH 1 (FLAGS)
// 	----IMAP RESPONSE----
// 	* 1 FETCH (FLAGS (\Seen))
// 	aaad OK FETCH completed.
// 	----IMAP REQUEST----
// 	aaae FETCH 2 (FLAGS)
// 	----IMAP RESPONSE----
// 	* 2 FETCH (FLAGS (\Seen))
// 	aaae OK FETCH completed.
// 	----IMAP REQUEST----
// 	aaaf FETCH 3 (FLAGS)
// 	----IMAP RESPONSE----
// 	* 3 FETCH (FLAGS (\Seen))
// 	aaaf OK FETCH completed.
// 	----IMAP REQUEST----
// 	aaag FETCH 4 (FLAGS)
// 	----IMAP RESPONSE----
// 	* 4 FETCH (FLAGS (\Seen))
// 	aaag OK FETCH completed.

imap.Disconnect();

// --------------------------------------------------------------------------------
// Now let's check GMail..
// Again, I've marked one email as Junk.

imap.KeepSessionLog = false;
imap.Ssl = true;
imap.Port = 993;
success = imap.Connect("imap.gmail.com");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Login
success = imap.Login("myAccount@gmail.com","GMAIL-IMAP-PASSWORD");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

imap.KeepSessionLog = true;

success = imap.SelectMailbox("Inbox");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

selectResponse = imap.LastResponse;
Debug.WriteLine(selectResponse);

// The response to GMail "SELECT Inbox" looks like this:

// * FLAGS (\Answered \Flagged \Draft \Deleted \Seen $Forwarded $NotPhishing $Phishing $label1 $label2 $label3 $label4 $label5 Junk NonJunk)
// * OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen $Forwarded $NotPhishing $Phishing $label1 $label2 $label3 $label4 $label5 Junk NonJunk \*)] Flags permitted.
// * OK [UIDVALIDITY 3] UIDs valid.
// * 46 EXISTS
// * 0 RECENT
// * OK [UIDNEXT 4147] Predicted next UID.
// * OK [HIGHESTMODSEQ 403404]
// aaai OK [READ-WRITE] Inbox selected. (Success)

sequenceNum = imap.NumMessages;
int minSeqNum = 1;
if (sequenceNum > 10) {
    minSeqNum = sequenceNum - 10;
}

while (sequenceNum >= minSeqNum) {
    string flags = imap.FetchFlags(sequenceNum,false);
    Debug.WriteLine(Convert.ToString(sequenceNum) + ": " + flags);
    sequenceNum = sequenceNum - 1;
}

// The output (for GMail) of the above loop is this:

// 	46: Junk \Seen
// 	45: NonJunk \Answered \Seen
// 	44: NonJunk \Seen
// 	43: \Answered \Seen
// 	42: \Answered \Seen
// 	41: NonJunk \Seen
// 	40: NonJunk \Answered \Seen
// 	39: NonJunk \Seen
// 	38: NonJunk \Seen
// 	37: NonJunk \Seen
// 	36: NonJunk \Seen

// As you can see, the email I marked as "Junk" using Mozilla Thunderbird has the Junk flag set.
// This concurs with GMail's list of FLAGS.  Apparently, since the IMAP server has a "Junk" flag,
// Thunderbird set it when I marked the email as Junk. 

imap.Disconnect();