Title: Mbsync and imap login problem
       Author: Solène
       Date: 17 May 2016
       Tags: solved email
       Description: 
       
       I have not found any answer about this so I share my fixed. I wanted
       to use mbsync with one IMAP server and encountered the following
       error.
       
           IMAP command 'AUTHENTICATE DIGEST-MD5' returned an error: NO
       Authentication failed
       
       A fix is to add the following to your ~/.mbsyncrc IMAPAccount
       declaration.
       
           AuthMechs LOGIN
       
       Using LOGIN instead of DIGEST-MD5 is still secure **if** you have an
       encrypted connection (IMAPS or STARTTLS). The login will be given
       plaintext inside the connection.