They are all runnning Avast Cloudcare Business
Ok. Alot of forum users have found with Avast they had to eg: “Disable the inbound mail scanning” in Avast due to it was either blocking or interfering with inbound mail. Have you tried that already ?. Its called the “MailShield”. See eM Client post on the topic below.
Version 8 upgrade - Problem with Gmail server connection - Announcement - eM Client
Russel_Markosky
Jul '20
Hello everyone,
We believe that you’re enjoying the look and features of our new eM Client version 8.
To those (Avast antivirus users) who are experiencing the issue with Gmail when eM Client can’t connect to the IMAP server - please disable the Avast Mail Shield or grant an exception to the eM Client app in Avast settings. Avast antivirus is blocking the connection to the server and this will allow you connect to your Gmail server again.
With kind regards,
eM Client Team