如果要将收件箱中的所有内容绝对标记为已读，请在登录并INBOX：

tag STORE 1:* +FLAGS (Seen)

您可以使用imaplib、任何套接字库或仅支持SSH的TCP程序(如socat或openssl s_client)来完成此操作。

以下是用Gmail标记所有已读邮件所需的命令的文字记录：

$ openssl s_client -connect imap.gmail.com:993 -crlf
* OK Gimap ready for requests from 208.65.73.143 f185mb90387173ioe

a LOGIN [username] [password]
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT
a OK [username] [name] authenticated (Success)

b SELECT INBOX
* FLAGS (Answered Flagged Draft Deleted Seen $Phishing $Forwarded Yellow $NotPhishing)
* OK [PERMANENTFLAGS (Answered Flagged Draft Deleted Seen $Phishing $Forwarded Yellow $NotPhishing *)] Flags permitted.
* OK [UIDVALIDITY 7] UIDs valid.
* 3617 EXISTS
* 0 RECENT
* OK [UIDNEXT 39807] Predicted next UID.
* OK [HIGHESTMODSEQ 4076284]
b OK [READ-WRITE] INBOX selected. (Success)

c STORE 1:* +FLAGS (Seen)
* 1 FETCH (FLAGS (Seen))
* 2 FETCH (FLAGS (Seen))
...
* 3617 FETCH (FLAGS (Seen))
c OK Success

d LOGOUT
* BYE LOGOUT Requested
d OK 73 good day (Success)

如果您有很多消息，您可能希望将+FLAGS.SILENT与STORE命令一起使用，这不会导致它将结果回显给您。