Test Connection to IMAP Server
==============================

Author: Momchil Ivanov <momchil@xaxo.eu>
Date  : 2019.10.04

Introduction
------------

  This article contains notes on how to test connection to IMAP
  server.

Basic authentication via telnet
-------------------------------

  Execute telnet to connect to the imap server, "I: " is prepended to
  the issued commands, "O: " is prepended to the output from the
  server:

    $ telnet imap.example.com 143

      O: * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN] Dovecot ready.
      I: a1 LOGIN MyUsername MyPassword
      O: a1 OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY PREVIEW=FUZZY LITERAL+ NOTIFY] Logged in
      I: a2 LIST "" "*"
      O: * LIST (\HasNoChildren) "." "INBOX"
      O: a2 OK List completed (0.029 + 0.000 + 0.028 secs).
      I: a3 EXAMINE web
      O: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
      O: * OK [PERMANENTFLAGS ()] Read-only mailbox.
      O: * 1 EXISTS
      O: * 0 RECENT
      O: * OK [UIDVALIDITY 1570177026] UIDs valid
      O: * OK [UIDNEXT 5] Predicted next UID
      O: a3 OK [READ-ONLY] Examine completed (0.002 + 0.000 + 0.001 secs).
      I: a4 FETCH 1 BODY[]
      O: * 1 FETCH (BODY[] {888}
      O: Return-Path: <momchil@xaxo.eu>
      O: Received: from t430.local ([10.75.23.6])
      O:         by mail.xaxo.eu (8.15.2/8.15.2) with ESMTP id x94D6npf021867
      O:         for <momchil@xaxo.eu>; Fri, 4 Oct 2019 15:06:49 +0200 (CEST)
      O:         (envelope-from momchil@xaxo.eu)
      O: From: Momchil Ivanov <momchil@xaxo.eu>
      O: Subject: Test email
      O: To: momchil@xaxo.eu
      O: Message-ID: <bd67c671-3660-5fc0-1f37-111f2b36d243@xaxo.eu>
      O: Date: Fri, 4 Oct 2019 15:07:24 +0200
      O: User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
      O:  Thunderbird/60.6.1
      O: MIME-Version: 1.0
      O: Content-Type: text/plain; charset=utf-8; format=flowed
      O: Content-Transfer-Encoding: 7bit
      O: Content-Language: en-US
      O: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED
      O:         autolearn=unavailable autolearn_force=no version=3.4.2
      O: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on mail.xaxo.eu
      O: 
      O: This is a test email message.
      O: 
      O: 
      O: Regards,
      O: 
      O: Author
      O: 
      O: )
      O: a4 OK Fetch completed (0.004 + 0.000 + 0.003 secs).
      I: a5 LOGOUT
      O: * BYE Logging out
      O: a5 OK Logout completed (0.001 + 0.000 secs).