Check for the QRESYNC IMAP extension

Author: jstedfast

MailKit/Net/Imap/ImapCapabilities.cs

@@ -142,35 +142,40 @@ public enum ImapCapabilities {
 		/// </summary>
 		Enable         = 1 << 19,
 
+		/// <summary>
+		/// The server supports the QRESYNC extension defined in rfc5162.
+		/// </summary>
+		QuickResync    = 1 << 20,
+
 		/// <summary>
 		/// The server supports the LIST-EXTENDED extension defined in rfc5258.
 		/// </summary>
-		ListExtended   = 1 << 20,
+		ListExtended   = 1 << 21,
 
 		/// <summary>
 		/// The server supports the CONVERT extension defined in rfc5259.
 		/// </summary>
-		Convert        = 1 << 21,
+		Convert        = 1 << 22,
 
 		/// <summary>
 		/// The server supports the METADATA extension defined in rfc5464.
 		/// </summary>
-		MetaData       = 1 << 22,
+		MetaData       = 1 << 23,
 
 		/// <summary>
 		/// The server supports the FILTERS extension defined in rfc5466.
 		/// </summary>
-		Filters        = 1 << 23,
+		Filters        = 1 << 24,
 
 		/// <summary>
 		/// The server supports the SEPCIAL-USE extension defined in rfc6154.
 		/// </summary>
-		SpecialUse     = 1 << 24,
+		SpecialUse     = 1 << 25,
 
 		/// <summary>
 		/// The server supports the MOVE extension defined in rfc6851.
 		/// </summary>
-		Move           = 1 << 25,
+		Move           = 1 << 26,
 
 		#region GMail Extensions
 
@@ -179,12 +184,12 @@ public enum ImapCapabilities {
 		/// <summary>
 		/// The server supports the XLIST extension (GMail).
 		/// </summary>
-		XList          = 1 << 26,
+		XList          = 1 << 27,
 
 		/// <summary>
 		/// The server supports the X-GM-EXT1 extension (GMail).
 		/// </summary>
-		GMailExt1      = 1 << 27
+		GMailExt1      = 1 << 28
 
 		#endregion
 	}

MailKit/Net/Imap/ImapEngine.cs

@@ -590,6 +590,7 @@ void UpdateCapabilities (ImapTokenType sentinel, CancellationToken cancellationT
 					case "ESEARCH":       Capabilities |= ImapCapabilities.ESearch; break;
 					case "SASL-IR":       Capabilities |= ImapCapabilities.SaslIR; break;
 					case "ENABLE":        Capabilities |= ImapCapabilities.Enable; break;
+					case "QRESYNC":       Capabilities |= ImapCapabilities.QuickResync; break;
 					case "LIST-EXTENDED": Capabilities |= ImapCapabilities.ListExtended; break;
 					case "CONVERT":       Capabilities |= ImapCapabilities.Convert; break;
 					case "METADATA":      Capabilities |= ImapCapabilities.MetaData; break;