（以偏概全）工作需要搜集了下主流邮箱服务都有哪些 IMAP 扩展，顺便分享一下。

说明

排名没有先后。

iCloud 居然没支持 IDLE....虽然 XAPPLEPUSHSERVICE 效果也不错就是了。

清单

imap.exmail.qq.com
IMAP4 IMAP4rev1 XLIST MOVE IDLE XAPPLEPUSHSERVICE AUTH=LOGIN NAMESPACE CHILDREN ID UIDPLUS

imap.gmail.com
IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 XYZZY SASL-IR AUTH=XOAUTH2 AUTH=PLAIN AUTH=PLAIN-CLIENTTOKEN AUTH=OAUTHBEARER AUTH=XOAUTH

imap.mxhichina.com
IMAP4rev1 IDLE XLIST UIDPLUS ID SASL-IR AUTH=XOAUTH AUTH=EXTERNAL

imap.263.net
IMAP4 IMAP4rev1 XLIST ID UIDPLUS

imap108.cn4e.com
IMAP4rev1 UIDPLUS AUTH=PLAIN

imap.zoho.com
IMAP4rev1 UNSELECT CHILDREN XLIST NAMESPACE IDLE MOVE ID AUTH=PLAIN SASL-IR UIDPLUS ESEARCH LIST-EXTENDED LIST-STATUS WITHIN COMPRESS=DEFLATE LITERAL- ACL

imap.zoho.com.cn
IMAP4rev1 UNSELECT CHILDREN XLIST NAMESPACE IDLE MOVE ID AUTH=PLAIN SASL-IR UIDPLUS ESEARCH LIST-EXTENDED LIST-STATUS WITHIN COMPRESS=DEFLATE LITERAL- APPENDLIMIT=10485760

imap.yandex.com
IMAP4rev1 CHILDREN UNSELECT LITERAL+ NAMESPACE XLIST BINARY UIDPLUS ENABLE ID AUTH=PLAIN AUTH=XOAUTH2 IDLE MOVE

imap.163.com(same as imap.126.com)
IMAP4rev1 XLIST SPECIAL-USE ID LITERAL+ STARTTLS XAPPLEPUSHSERVICE UIDPLUS X-CM-EXT-1

imap.sina.com (same as imap.sina.com.cn)
IMAP4rev1 ID

imap.189.cn
IMAP4 IMAP4rev1  XLIST ID XAPPLEPUSHSERVICE AUTH=KERBEROS_V4

imap.139.com
IMAP4rev1 XLIST ID RM_MAIL_TYPE UIDPLUS

imap.mail.me.com
pv33p00im-iscream023 1822B45 XAPPLEPUSHSERVICE IMAP4 IMAP4rev1 SASL-IR AUTH=ATOKEN AUTH=PLAIN

imap.outlook.com
IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+