[keycloak-user] Keycloak client hangs after creating 9 users

Hi all, I'm having some trouble with creating users, using the Keycloak Admin REST API in Java. I'm trying to create a few dozen users in Keycloak and I want to send each user an email to notify them to update their passwords in a for-loop. But everytime, after creating a user and sending an email for 9 users, the Keycloak client hangs indefinitely when it's trying to send an email for the 10th user. Im running Keycloak in a docker container with PostgreSQL and MailHog. Do any of you have any ideas? Regards, Maickel