Hello. I have been using Pegasus Mail 4.80 on Windows 11 since some time now without any problems. But since yesterday, I can no longer send emails. I can still receive emails though. Message I get is following: 'SMTP Network or Protocol Error sending mail. Protocol error: The server has unexpectedly refused or failed a request made by Pegasus Mail.' Anything I could do to solve the problem? Many thanks in advance for your help.