New email users doesnt work

[kaneda]

We are having some problems with new email users, old users works fine, but the new accounts cannot login into webmail neither send or receive email, but if you check it at database the accounts exists in table is_is_users or something like that.

Any idea about what could be happening? We cannot add any new email accounts. Any help very appreciated. Thanks a lot.
Version was updated about july to 2.2.13