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Oskar K.
Asked: 2016-05-08 04:55:38 +0800 CST

The greeting from an IMAP server — format?

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I'm trying to understand the specification of IMAP found at INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1 (RFC3501)
Does the greeting from a server always have the following format?

* OK something doesn't matter what

That is, does it start with * OK always and has the * and one whitespace in the beginning?

email imap protocols

1 Answers

  1. No. It can have at least three variants (see page 14): 

         (1) connection without pre-authentication (OK greeting)
     (2) pre-authenticated connection (PREAUTH greeting)
     (3) rejected connection (BYE greeting)
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