We are happy to let you know that we have released an update for SSL Manager for for Mail Services – Plesk. In this version we have completely fixed many reported issues and one of them was the inability to login to your mail account which happened because the Postfix server was not able to authenticate the users through SASL.
Please proceed with the update at the earliest.
– Fixed several known and reported issues
– Fixed incompatibility issues with the newest update of Plesk