Also, Mailhog: https://github.com/mailhog/MailHog
Per mailpit author mailhog is not actively developed and has performance issues. Hence developed this alternative
1. Relationships management (particularly many to many) 2. Persistence of preferences like sort and filters 3. No builtin UI components to display audit logs
PS: i am not associated with them in anyway. Just looking for versatility in tools in this space.
Also XavaPro (java specific and server generated pages design) is much more feature rich