blocking address by account

Is there a way to block addresses specifically for an account?  For example, I would like to block [email protected] from account1 and allow [email protected] for account 2.

Hi, unfortunately this is not possible in eM Client, you can only block email addresses for all your accounts.
But you might find rules useful, just setup a rule that redirects your mail from [email protected] to your other account.

Hope this helps,
Paul.