If you temporarily want to stop receiving messages for a mail account, but don’t want to remove the account from Vivaldi Mail altogether, you can enable offline mode.

To take a mail account offline:

1. Go to Settings > Mail > Mail accounts.
2. Select the account.
3. In Identity settings, enable “Take Account Offline”.

You’ll still be able to send messages from the account, but won’t receive any new incoming messages until you turn off the setting.