LB are currently facing intermittent issues with mail service hosted on their Austin mail servers. If your domain’s MX records are pointing to the below MX records, your services might be affected :-
us2.mx1.mailhostbox.com. us2.mx2.mailhostbox.com. us2.mx3.mailhostbox.com.
You can check your domain’s MX records using the link – http://www.mxtoolbox.com/. You might face errors while login on to your webmail account
Their system admin team is already working on this and are trying to fix this asap. We and LB sincerely regret the inconvenience caused.