I’m thinking of picking up some parts or using an old laptop to host a few services, passbolt being one of them. I’ve seen that it requires an SMTP server though. Is this actually required? And would I be able to use this without getting a domain name?
No worries! Here is a guide for setting up smtp for passbolt with gmail
https://www.techrepublic.com/article/how-to-configure-smtp-server-self-hosted-passbolt/