In the sidebar's profile menu, click "Profile": notification preferences are personal, they do not depend on the active community.

The last tab of your profile controls how OptimCE tells you about things.

Each row is a kind of activity — news, invoices, deadlines… — and each column a channel. "Everything else" covers the categories without a row of their own. Essential messages (invoices, invitations, missed deadlines) are always delivered.

Switch "Email" off on the "News posts" row: you will still see the posts inside the application, but no email will be sent.

Nothing is applied until you save. Click "Save preferences".

A confirmation appears next to the button. It clears as soon as you change a setting again.

Your preferences belong to your account, not to this device: you will find them unchanged the next time you sign in, wherever that is.