3 - . . .
3- , . , - SMTP- SMTP. SMTP- , 3-, .
3- , , 110- - , . 3 -, TCP- 110 . 3 . . 3 - .
3 , ASCII-, , "" - <SP>. " " " " - <CRLF>. , 40 .
3- -, , - <CRLF>. 512 . - : ("+") ("-ERR"). 3 - , , .
3- . <CRLF>. , "." ( - 046) <CRLF>, . . "CRLF.CRLF".
3- . TCP- 3- , - (AUTHORIZATION state). 3-, . . .
- (TRANSACTION state). .
( QUIT), UPDATE - . 3- ( - COMMIT) TCP-.
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, , 3- .
TCP- 3-, 3- ( 3- : -, S - 3):
S: +OK 3 server ready
3- (AUTHORIZATION), 3-. USER PASS - ( ), - , . 3 - .
USER :
USER name
(name) , . 3-. "+OK", PASS - QUIT - . "-ERR", USER, . :
: USER frated
S: -ERR sorry, no mailbox for frated here
: USER mrose
S: +OK mrose is a real hoopy frood
PASS USER:
PASS string
. PASS, 3-, USER PASS, . 3- "+OK", , , .. TRANSACTION. 3- "-ERR", , :
: USER mrose
S: +OK mrose is a real hoopy frood
C: PASS secret
S: +OK mrose's maildrop has 2 messages (320 octets)
3-: QUIT - "+", :
: QUIT
S: + dewey POP3 server signing off
3- , 3- "" ( , , EXCLUSIVE ACCESS LOCK), 3- TRANSACTION, .
STAT ( ) .
3- , , 3- . , , . : "+ nn mm", nn - , mm - :
: STAT
S: + 2 320
RETR - :
RETR msg
- . , "-ERR".
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: RETR 1
S: + 120 octets
S: <text message>
S:.
, , , , DELE:
DELE msg
: . , , , UPDATE.
: DELE 1
S: + message 1 deleted
: DELE 2
S: -ERR message 2 already deleted
3- NOOP. "+":
: NOOP
S: +
3 -.
S: <wait for connection on TCP port 110>
C: <open connection>
S: +OK 3 server ready
: USERmrose
S: +OK mrose is a real hoopy frood
: PASS secret
S: +OK mrose's maildrop has 2 messages (320 octets)
: STAT
S: +OK 2 320
: LIST
S: +OK 2 messages (320 octets)
S: 1 120
S: 2 200
S:.
: RETR 1
S: +OK 120 octets
S: <the 3 server sends message 1>
S:.
: DELE 1
S: +OK message 1 deleted
: RETR 2
S: +OK 200 octets
S: <the 3 server sends message 2>
S:.
: DELE 2
S: +OK message 2 deleted
: QUIT
S: +OK dewey 3 server signing off (maildrop empty)
: <close connection>
S: <wait for next connection>
POP, , . 3 - IMAP.
