Sogo / cram-md5 ??

==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
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======== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.2
- Linux/BSD distribution name and version: Debian 8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Mysql
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue:
====

Hi,

I have implemented the cram-md5 auth mechanism to dovecot.
When using an email client, things are working well ...
But when trying to use Sogo, I am able to connect, but there is no mails ...
When checking sogo.log :

  base=(null)
  base-class=(null))
  = <0x0x7f52e3e36170[NGImap4Client]: login=toto@domain.ltd(pwd) socket=<NGActiveSocket[0x0x7f52e3941080]: mode=rw address=<0x0x7f52e3bc1bc0[NGInternetSocketAddress]: host=localhost port=39779> connectedTo=<0x0x7f52e38fc8e0[NGInternetSocketAddress]: host=127.0.0.1 port=143>>>
Aug 26 11:02:07 sogod [4020]: <0xE3E95180[SOGoMailFolder]:folderINBOX> renewing imap4 password
Aug 26 11:02:07 sogod [4020]: [ERROR] <0x0x7f52e3cf5cf0[NGImap4ConnectionManager]> IMAP4 login failed:
  host=127.0.0.1, user=toto@domain.ltd, pwd=yes

Is not taking into account the cram-md5 auth process, not able to connect to imap4  ....
Do you know how to implement it ?

Thx