POP3 protocol

authorization phase

• client commands:

  • user: declare username
  • pass: password

• server responses

  • +OK
  • -ERR

transaction phase, client:

• list: list message numbers

• retr: retrieve message by number

• dele: delete

• quit

C: list

S: 1 498

S: 2 912

S: .

C: retr 1

S: <message 1 contents>

S: .

C: dele 1

C: retr 2

S: <message 1 contents>

S: .

C: dele 2

C: quit

S: +OK POP3 server signing off

S: +OK POP3 server ready

C: user alice

S: +OK

C: pass hungry

S: +OK user successfully logged on

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