# 5032 = 'WITHIN search extension for IMAP',
4978 => 'IMAP COMPRESS Extension',
# 5182 = 'IMAP Extension for Referencing the Last SEARCH Result',
+ # 5256 => 'IMAP SORT and THREAD extensions',
# 5738 => 'IMAP Support for UTF-8',
# 8474 => 'IMAP Extension for Object Identifiers',
+
+ # 8620 => JSON Meta Application Protocol (JMAP)
+ # 8621 => JSON Meta Application Protocol (JMAP) for Mail
# ...
# TODO: flesh this out