My company has been using Jira for a while. And many customers don't receive the invitation mail for many reason, sometime they get mistaken as spam, and sometime they get mistaken as phishing mail and got filtered. We have tried many way to fix this problem but we also find that the domain for invitation mail isn't changable.
I know there is another question about this but it's from 2021 so i don't know what about 2023.