Roundcube is adding .domain-prefix (.agacademy for example) to email addresses when sending outbound email from Roundcube. For instance I just created a test account for firstname.lastname@example.org and when I sent an outbound email from Roundcube it sent from email@example.com. This is happening for all of our domains (as far as I can tell).
How can we fix the server so that new accounts are created with the correct email address? Thanks.