For the 18 months I've been using civiCRM. the "Send Test" on traditional email worked fine.
Now I am getting the message "Could not identify any recipients. Perhaps your test group is empty, or you tried sending to contacts that do not exist and you have no permission to add contacts." My test group is fine. When I click "Send Test" my test email address is put "On Hold." If I send to the test group, everyone in the group is put "On Hold."
Any idea why this is happening?
My civiCRM instance civiCRM: 5.40.3 Drupal: 7.80