Found invalid data while decoding.at MailClient.Protocols.AirSync.AirSyncItemSynchronizer

Hello.

Since last few days I’m having issues with sending emails using OWA/365. Here is the extract from the log. Nothing was changed on the email server.

Any ideas?

eM Client 10.0.3530+f0b89b73a0 (Windows)
20:59:24 [email protected] [AirSync] MailClient.Accounts.ConnectionException: Found invalid data while decoding.