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4.4.14.3 IMAP
.. ( )

IMAP 4.1
A.

IMAP 4.1 (INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1, V.Crispin, RFC-2060, December 1996) TCP 143. IMAP 993. IMAP POP-3. - .


POP3 IMAP ( ).

((link)) Downloadhub 4u

IMAP 4.1 . , . , , , CRLF. ( ) , .

((link)) Downloadhub 4u

. - ( - , A0001, A0002 ..), (tag). . , , , . - , (. ). - (. authenticate). , . "+".

: , , , bad , - .

( ) . , , . .

IMAP 4.1 , , , . .

((link)) Downloadhub 4u

, , , , "*" .

. .

. , , . , , , . : ok ( ), no ( ) bad ( , , ).

IMAP 4.1 . , "*" "+".

. , . , , .

. .

IMAP 4.1 .

((link)) Downloadhub 4u

32- , 64- , . , UID, .

, , . [IMAP-DISC].

UID uidvalidity (ok) . UID - , UID .


UID . IMAP, UID , UID .

UID . , UID. UID 32- . 1, , , .

UID , . UID , , UID .

, 1. 1 , .

. , , . , .

, . , 287 , 523 , UID 12345, 286 , UID 236 UID.

((link)) Downloadhub 4u

, . . IMAP 4.1. .

, . "\". (\deleted \seen) , . :

\seen
\answered
\flagged "" ,
\deleted expunge
\draft (, ).
\recent . , ; \recent. .

, , . . "\". . ; , .


\recent . \recent store, .

. , [RFC-822], . [SMTP], . , IMAP 4.1 copy, . IMAP 4.1 append, , append.

( [RFC-822]). [RFC-822]. [MIME-IMB]. , RFC-822, IMAP 4.1 . .

((link)) Downloadhub 4u

IMAP 4.1 . . , . bad no .

, . , .

, . , .

, . .


downloadhub 4u

. 4.4.14.2.1. IMAP

(1) C ( OK)
(2) C ( PREAUTH)
(3) ( BYE)
(4) LOGIN AUTHENTICATE
(5) SELECT EXAMINE
(6) CLOSE, SELECT EXAMINE
(7) LOGOUT, ,

((link)) Downloadhub 4u

IMAP 4.1 . IMAP 4.1 : , , , , NIL.

.

.

: . . , , , .

( CR LF). , . , CRLF. CRLF . , .

7- CR LF, (<">). "" {0}, CRLF.

: , , .

((link)) Downloadhub 4u

8- [MIME-IMB]. IMAP 4.1 8- , , [CHARSET]. BINARY, . " " - NUL . , BASE64, . CTL .

((link)) Downloadhub 4u

, , . . () - .

((link)) Downloadhub 4u

"NIL" - . "" ().

((link)) Downloadhub 4u

. INBOX , " " ( ). . , .

((link)) Downloadhub 4u

, "#" . , , USENET "#news", . , comp.mail.misc "#news.comp.mail.misc", "comp.mail.misc" (., ).

((link)) Downloadhub 4u

UTF-7, [UTF-7]. , UTF-7:

  1. UTF-7 "+" ; "+" , USENET.
  2. UTF-7 BASE64, "/", "/" .
  3. UTF-7 "\"; "\" .
  4. UTF-7 "~", , , (home).
  5. UTF-7 , , US-ASCII .

UTF-7, US-ASCII "&" ; , 0x20-0x25 0x27-0x7e. "&" (0x26) "&-". ( 0x00-0x1f, 0x7f-0xff, 16- ) BASE64, [UTF-7]. BASE64 US-ASCII, .

"&" BASE64 "-" US-ASCII. US-ASCII, US-ASCII ( , , 16- , "-"). , , : ~peter/mail/&ZeVnLIqe-/&U,BTFw-

((link)) Downloadhub 4u

, . , . , , , , (, ), . , . , . , ( EXPUNGE). . , .

((link)) Downloadhub 4u

( EXPUNGE), . , , . , (1) , , (2) .

((link)) Downloadhub 4u

, , , 30 . .

((link)) Downloadhub 4u

, , .

, . , , - . , .

, , FETCH STORE .

, EXPUNGE ( FETCH, STORE SEARCH), EXPUNGE . FETCH, STORE SEARCH, EXPUNGE, . , , FETCH, STORE SEARCH, , , . , ( ) :

FETCH + NOOP + STORE
STORE + COPY + FETCH
COPY + COPY
CHECK + FETCH

, :

FETCH + STORE + SEARCH + CHECK
STORE + COPY + EXPUNGE

((link)) Downloadhub 4u

IMAP 4.1. , .

((link)) Downloadhub 4u

: CAPABILITY, NOOP LOGOUT.

5.1.1. CAPABILITY

: .
: : CAPABILITY.
: OK - ;
BAD - <./p>

CAPABILITY , . CAPABILITY "IMAP 4.1" , OK. . , CAPABILITY . , "AUTH=" , . . , "blurdybloop" "AUTH=XBLURDYBLOOP", "XAUTH=BLURDYBLOOP" "XAUTH=XBLURDYBLOOP".

, .

: C: abcd CAPABILITY
S: * CAPABILITY IMAP 4.1 AUTH=KERBEROS_V4
S: abcd OK CAPABILITY completed

5.1.2. NOOP

: .
: .
: OK - ;
BAD - ;
NOOP .

, NOOP , . NOOP - .

: C: a002 NOOP
S: a002 OK NOOP completed
. . .
C: a047 NOOP
S: * 22 EXPUNGE
S: * 23 EXISTS
S: * 3 RECENT
S: * 14 FETCH (FLAGS (\Seen \Deleted))
S: a047 OK NOOP completed

5.1.3. LOGOUT

: .
: BYE.
: OK - ;
BAD - .

LOGOUT , . BYE, OK, .

: C: A023 LOGOUT
S: * BYE IMAP 4.1 Server logging out
S: A023 OK LOGOUT completed
( )

((link)) Downloadhub 4u

, AUTHENTICATE LOGIN . IMAP RFC-1731. AUTHENTICATE , LOGIN .

. LOGIN "anonymous". . .

. (CAPABILITY, NOOP LOGOUT), : AUTHENTICATE LOGIN.

5.2.1. AUTHENTICATE

: .
: .

OK , " ";
NO : , ;
BAD , .

AUTHENTICATE , [IMAP-AUTH]. , . . , AUTHENTICATE NO.

. - "+", BASE64. , BASE64. , , "*". , AUTHENTICATE, BAD.

. , , . CRLF, , CRLF OK . , . , , . - .

. ; - . AUTHENTICATE NO, , AUTHENTICATE, LOGIN. , , LOGIN .

: S: * OK KerberosV4 IMAP4rev1 Server
C: A001 AUTHENTICATE KERBEROS_V4
S: + AmFYig==
C: BAcAQU5EUkVXLkNNVS5FRFUAOCAsho84kLN3/IJmrMG+25a4DT
+nZImJjnTNHJUtxAA+o0KPKfHEcAFs9a3CL5Oebe/ydHJUwYFd
WwuQ1MWiy6IesKvjL5rL9WjXUb9MwT9bpObYLGOKi1Qh
S: + or//EoAADZI=
C: DiAF5A4gA+oOIALuBkAAmw==
S: A001 OK Kerberos V4 authentication successful

5.2.2. LOGIN

: , .
: - .
: OK - login , ;
NO - login : ;
BAD - .

LOGIN .

: C: a001 LOGIN SMITH SESAME
S: a001 OK LOGIN completed

((link)) Downloadhub 4u

" " , -. SELECT EXAMINE "" .

(CAPABILITY, NOOP LOGOUT), " " : SELECT, EXAMINE, CREATE, DELETE, RENAME, SUBSCRIBE, UNSUBSCRIBE, LIST, LSUB, STATUS APPEND.

5.3.1. SELECT

: .
: : FLAGS, EXISTS, RECENT;
OK: UNSEEN, PERMANENTFLAGS.

: OK - , "";
NO - : , ;
BAD - .

SELECT , , . OK, :

FLAGS - , .
<n> EXISTS .
<n> RECENT \Recent.
OK [UIDVALIDITY <n> ] .

"" OK, .

, FLAGS, OK PERMANENTFLAGS, , .

. . SELECT . , , SELECT , . , OK "[READ-WRITE]".

, , " " OK SELECT "[READ-ONLY]". " " , EXAMINE, . .newsrc , " ".

: C: A142 SELECT INBOX
S: * 172 EXISTS
S: * 1 RECENT
S: * OK [UNSEEN 12] Message 12 is first unseen
S: * OK [UIDVALIDITY 3857529045] UIDs valid
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS (\Deleted \Seen \*)] Limited
S: A142 OK [READ-WRITE] SELECT completed

5.3.2. EXAMINE

: .
: : FLAGS, EXISTS, RECENT;
OK: UNSEEN, PERMANENTFLAGS.

: OK , " " ;
NO , " "; ; ;
BAD .

EXAMINE SELECT , , " ". . OK EXAMINE "[READ-ONLY]".

: C: A932 EXAMINE blurdybloop
S: * 17 EXISTS
S: * 2 RECENT
S: * OK [UNSEEN 8] Message 8 is first unseen
S: * OK [UIDVALIDITY 3857529045] UIDs valid
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS ()] No permanent flags permitted
S: A932 OK [READ-ONLY] EXAMINE completed

5.3.3. CREATE

: .
: - .

OK ;
NO : ;
BAD .

CREATE . OK , . INBOX , , . NO.

( , LIST), . , , .

- - , , CREATE. , "foo/bar/zap" , "/" , foo/ foo/bar/, .

, , , UID.

: C: A003 CREATE owatagusiam/
S: A003 OK CREATE completed
C: A004 CREATE owatagusiam/blurdybloop
S: A004 OK CREATE completed

: , "/" . "/" , "owatagusiam" "blurdybloop". .

5.3.4. DELETE

: .
: - .
: OK - ;
NO - : ;
BAD - .

DELETE . OK , . INBOX .

DELETE , . , "foo" "foo.bar" (, "." ), "foo" "foo.bar". , , \Noselect.

, , \Noselect. , \Noselect.

, , UID.

: C: A682 LIST "" *
S: * LIST () "/" blurdybloop
S: * LIST (\Noselect) "/" foo
S: * LIST () "/" foo/bar
S: A682 OK LIST completed
C: A683 DELETE blurdybloop
S: A683 OK DELETE completed
C: A684 DELETE foo
S: A684 NO Name "foo" has inferior hierarchical names
C: A685 DELETE foo/bar
S: A685 OK DELETE Completed
C: A686 LIST "" *
S: * LIST (\Noselect) "/" foo
S: A686 OK LIST completed
C: A687 DELETE foo
S: A687 OK DELETE Completed
C: A82 LIST "" *
S: * LIST () "." blurdybloop
S: * LIST () "." foo
S: * LIST () "." foo.bar
S: A82 OK LIST completed
C: A83 DELETE blurdybloop
S: A83 OK DELETE completed
C: A84 DELETE foo
S: A84 OK DELETE Completed
C: A85 LIST "" *
S: * LIST () "." foo.bar
S: A85 OK LIST completed
C: A86 LIST "" %
S: * LIST (\Noselect) "." foo
S: A86 OK LIST completed

5.3.5. RENAME

: , .
: - .

: OK ;
NO : , ;
BAD .

RENAME . OK , . . NO.

, . , "foo" "zap" "foo/bar" (, "/" ) "zap/bar".

, , UID.

INBOX , . , INBOX . INBOX, INBOX.

: C: A682 LIST "" *
S: * LIST () "/" blurdybloop
S: * LIST (\Noselect) "/" foo
S: * LIST () "/" foo/bar
S: A682 OK LIST completed
C: A683 RENAME blurdybloop sarasoop
S: A683 OK RENAME completed
C: A684 RENAME foo zowie
S: A684 OK RENAME Completed
C: A685 LIST "" *
S: * LIST () "/" sarasoop
S: * LIST (\Noselect) "/" zowie
S: * LIST () "/" zowie/bar
S: A685 OK LIST completed
C: Z432 LIST "" *
S: * LIST () "." INBOX
S: * LIST () "." INBOX.bar
S: Z432 OK LIST completed
C: Z433 RENAME INBOX old-mail
S: Z433 OK RENAME completed
C: Z434 LIST "" *
S: * LIST () "." INBOX
S: * LIST () "." INBOX.bar
S: * LIST () "." old-mail
S: Z434 OK LIST completed

5.3.6. SUBSCRIBE

: .
: - .
: OK - ;
NO - : ;
BAD - .

SUBSCRIBE "" "" , LSUB. OK .

SUBSCRIBE, . , .

: , , , "system-alerts") , .

: C: A002 SUBSCRIBE #news.comp.mail.mime
S: A002 OK SUBSCRIBE completed

5.3.7. UNSUBSCRIBE

: .
: - .
: OK - ;
NO - : ;
BAD - .

UNSUBSCRIBE "" "" , LSUB. OK , .

: C: A002 UNSUBSCRIBE #news.comp.mail.mime
S: A002 OK UNSUBSCRIBE completed

5.3.8. LIST

: ,
(wildcard).
: LIST.

: OK list ;
NO : list ;
BAD .

LIST , . LIST, , .

LIST . , (\Marked \Unmarked) , , 1200 20 .

, (""), , , SELECT. . , . ("") , . , , , . . , , .

- . .

, , . , . , . , .

, UNIX:

~smith/Mail/ foo.* ~smith/Mail/foo.*
Archive/ % archive/%
#news. comp.mail.* #news.comp.mail.*
~smith/Mail/ /usr/doc/foo /usr/doc/foo
archive/ ~fred/Mail/* ~fred/Mail/*

. , "~smith/Mail" - "/u2/users/smith/Mail", , .

"*" (wildcard), . "%" "*", . "%" , . , , \Noselect. , (wildcard). , UNIX "*" , "/" .

INBOX LIST, INBOX , "INBOX", , .

: C: A101 LIST "" ""

S: * LIST (\Noselect) "/" ""
S: A101 OK LIST Completed
C: A102 LIST #news.comp.mail.misc ""
S: * LIST (\Noselect) "." #news.
S: A102 OK LIST Completed
C: A103 LIST /usr/staff/jones ""
S: * LIST (\Noselect) "/" /
S: A103 OK LIST Completed
C: A202 LIST ~/Mail/ %
S: * LIST (\Noselect) "/" ~/Mail/foo
S: * LIST () "/" ~/Mail/meetings
S: A202 OK LIST completed

5.3.9. LSUB

: -,
(wildcards).
: : LSUB

: OK ;
NO : ;
BAD .

LSUB , "" "". LSUB. LSUB , LIST.

, , . , LSUB \Noselect. , .

: C: A002 LSUB "#news." "comp.mail.*"
S: * LSUB () "." #news.comp.mail.mime
S: * LSUB () "." #news.comp.mail.misc
S: A002 OK LSUB completed

5.3.10. STATUS

: , .
: : STATUS.
: OK - ;
NO - : ;
BAD - .

STATUS . - ( STATUS \Recent).

STATUS IMAP 4.1 EXAMINE , , .

LIST, STATUS . " ", . , STATUS . , :

MESSAGES
RECENT \Recent
UIDNEXT , . , , . UID , .
UIDVALIDITY
UNSEEN , \Seen

: C: A042 STATUS blurdybloop (UIDNEXT MESSAGES)
S: * STATUS blurdybloop (MESSAGES 231 UIDNEXT 44292)
S: A042 OK STATUS completed

5.3.11. APPEND

: ,
- ,
- ,

: -

: OK
NO : , /,
BAD

APPEND . [RFC-822]. 8- . , 8- , 8- APPEND 7-, [MIME-IMB]. , , .

date_time, , , . append - , , APPEND.

, , . , , "[TRYCREATE]" NO. CREATE, , , APPEND.

, . , EXISTS. , APPEND NOOP ( CHECK).

: C: A003 APPEND saved-messages (\Seen) {310}
C: Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)
C: From: Fred Foobar
C: Subject: afternoon meeting
C: To: mooch@owatagu.siam.edu
C: Message-Id:
C: MIME-Version: 1.0
C: Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
C:
C: Hello Joe, do you think we can meet at 3:30 tomorrow?
C:
S: A003 OK APPEND completed

: APPEND , [SMTP].

((link)) Downloadhub 4u

" ", , . (CAPABILITY, NOOP LOGOUT), (SELECT, EXAMINE, CREATE, DELETE, RENAME, SUBSCRIBE, UNSUBSCRIBE, LIST, LSUB, STATUS APPEND), : CHECK, CLOSE, EXPUNGE, SEARCH, FETCH, STORE, COPY UID.

5.4.1. CHECK

: .
: - ;
: OK - ;
BAD - .

CHECK . , (, ). , NOOP.

, CHECK . NOOP, CHECK.

: C: FXXZ CHECK
S: FXXZ OK CHECK Completed

5.4.2. CLOSE

: .
: - .
: OK - , " ";
NO - , ;
BAD - .

CLOSE , \Deleted, " ". EXPUNGE .

, EXAMINE " ".

, SELECT, EXAMINE LOGOUT CLOSE. SELECT, EXAMINE LOGOUT . , CLOSE-LOGOUT CLOSE-SELECT , EXPUNGE-LOGOUT EXPUNGE-SELECT, EXPUNGE ( ).

: C: A341 CLOSE
S: A341 OK CLOSE completed

5.4.3. EXPUNGE

: .
: : EXPUNGE.
: OK - ;
NO - : (, );
BAD - .

EXPUNGE , \Deleted. OK, EXPUNGE .

: C: A202 EXPUNGE
S: * 3 EXPUNGE
S: * 3 EXPUNGE
S: * 5 EXPUNGE
S: * 8 EXPUNGE
S: A202 OK EXPUNGE completed

: , 3, 4, 7 11 \Deleted. , .

5.4.4. SEARCH

: , [CHARSET]-.
( ).
: : SEARCH.
: OK - ;
NO - : ;
BAD -

SEARCH , . . SEARCH , .

, ( AND) , . , DELETED FROM "SMITH" SINCE 1-Feb-1994 , 1- 1994. (, OR NOT).

[CHARSET] "CHARSET", [CHARSET]. [CHARSET] , . [MIME-IMB] [MIME-HDRS] [RFC-822]/[MIME-IMB] , [CHARSET], US-ASCII. US-ASCII , . [CHARSET], NO ( BAD).

, , , . . .

< > ,
ALL . AND
ANSWERED \Answered.
BCC <> , BCC .
BEFORE <> , .
BODY <> , .
CC <> , CC .
DELETED \Deleted.
DRAFT \Draft.
FLAGGED c \Flagged.
FROM <> , FROM .
HEADER < > <> , ( [RFC-822]) .
KEYWORD <> .
LARGER <n> [RFC-822] .
NEW , \Recent, \Seen. "(RECENT UNSEEN)".
NOT < > , .
OLD , \Recent. "NOT RECENT" ( "NOT NEW").
ON <> , .
OR < 1> < 2> , .
RECENT , \Recent.
SEEN , \Seen.
SENTBEFORE <> , , [RFC-822].
SENTON <> , , [RFC-822]
SENTSINCE <> , , [RFC-822]: .
SINCE <> , .
SMALLER <n> [RFC-822] .
SUBJECT <> , SUBJECT .
TEXT <> ,
TO <> , TO.
UID < > , .
UNANSWERED <>, \Answered.
UNDELETED , \Deleted.
UNDRAFT , \Draft.
UNFLAGGED , \Flagged.
UNKEYWORD <> , .
UNSEEN , \Seen.

: C: A282 SEARCH FLAGGED SINCE 1-Feb-1994 NOT FROM "Smith"
S: * SEARCH 2 84 882
S: A282 OK SEARCH completed

5.4.5. FETCH

: ,
.
: : FETCH
: OK - ;
NO - : ;
BAD - .

FETCH , . , . , :

ALL : (FLAGS INTERNALDATE RFC822.SIZE ENVELOPE)
BODY BODYSTRUCTURE.
BODY[

((link)) Downloadhub 4u

In recent years, law enforcement agencies and copyright holders have stepped up efforts to crack down on online piracy platforms like DownloadHub 4U. In 2020, the website was reportedly shut down by Indian authorities, who arrested several individuals associated with the platform. The takedown of DownloadHub 4U sent shockwaves through the online piracy community, with many users scrambling to find alternative platforms to access their favorite content.

But is it too good to be true? Almost always, yes.

Many libraries also offer free access to or Hoopla —all legal and safe.

However, the demand for free content remains. Unless global subscription prices drop and content fragmentation reduces, alternative piracy sites will continue to replace those that are shut down. downloadhub 4u

: Popular shows from major streaming platforms available in various resolutions.

: From the latest blockbusters to timeless classics.

In the ever-evolving landscape of digital media, has emerged as a prominent name for enthusiasts seeking a vast library of movies, television shows, and multimedia content. Known for its extensive catalog and user-friendly accessibility, the platform caters to a global audience looking for high-quality downloads. This article explores everything you need to know about DownloadHub 4u, its features, and the importance of navigating such platforms safely. What is DownloadHub 4u? In recent years, law enforcement agencies and copyright

In the endless search for free movies, TV shows, and web series, you’ve likely stumbled across a site called . It promises the latest blockbusters, popular Netflix originals, and classic films—all at zero cost.

However, as with many online piracy platforms, DownloadHub 4U operated in a gray area, with much of the content available for download being copyrighted without permission. This raised serious concerns about the legitimacy of the platform and the potential consequences for users who chose to download content from the site. Moreover, the website's business model relied heavily on advertising, with many users reporting intrusive pop-ups and redirects to other potentially malicious websites.

In many countries (Germany, USA, UK, France, Japan), Internet Service Providers track torrent traffic and visits to known pirate domains. You could receive a warning letter, a fine, or even have your internet speed throttled. But is it too good to be true

When one domain gets blocked by ISPs or court orders (common in India, the US, and the EU), the operators simply launch a new mirror site with a slightly different URL—hence the constant “4u,” “hub,” “movies,” or “watch” variations.

: Highly sought-after Hollywood movies dubbed in Hindi and other regional languages. Key Features of the Platform