However it is a bug given the emails in Gmail are not flagged as “important
It’s not a bug, Gmail account inbox emails show the Important tag when adding in mail clients such as eM Client and others. This has been the case for years with a Google account. You may not see them online but they are there when you sync mail.
“Gmail assigns the ‘Important’ label to all messages synchronized through IMAP”.
So the options are to “not show” the Important tag in eM Client IMAP account settings or you have to manually create a filter in Gmail online not to show them. But much easier in eM Client.
Also as @Michal_Burger wrote recently in the below thread, the next update will also give Gmail users the ability in setting to show the Important tag “as an icon” if you do want to see it, like in Gmail online and not the full important text which will be a good option as well.
https://forum.emclient.com/t/remove-tag-from-subject-line-em-9/81281/5
Based on the user’s feedback we decided to make some improvements to the next update.
We’ll allow to completely disable (or show just icons) displaying tags in the single line layout as well (via a setting).
We’ll display GMail important tag in a way GMail displays it in its web mail (just an icon, not the full Important text)
I hope this will resolve this issue, it is going to be there soon. We listen to you!