We have two Jira Users with this strange notfication problems. One Agent and one Customer. The Helpdesk Agent gets no Mails from Jira since 01.03.2023. He is in an Admin Group with the same rights as the other agents also his notfitication settings are the same as the settings of another Agent that gets the mails. We also have one customer that doesn´t get the mails when any Agent is answering her request, she only gets the information via the online portal. She is also in an AD-Group where other 10 people don´t have this issue. We have also already checked our mail server and there are no mails sent from Jira, so there is no spam filtering.