Build Fastmail
NOT REALLYreplaces $6/mosaves $72/yrback to the verdict
Before step 1
you will need
- existing IMAP and SMTP mailbox
- OAuth client credentials where required
- desktop keychain access
- local disk space
Delivery order
Scaffold the smallest runnable application and document its commands.
done whenThe project starts from a documented command in a clean checkout.
Implement the primary data model and core workflow.
done whenThe main object can be created, read and changed end to end.
Add validation, safe failure states, and persistence.
done whenBad input is refused with a readable message and nothing is left corrupted.
Cover the critical path with automated tests.
done whenThe highest-risk behavior fails the suite when it breaks.
Exercise a clean install from the README and fix every missing step.
done whenA fresh clone reaches the first successful workflow using only the README.
That is the whole plan for Fastmail. What it deliberately does not cover is below · check the gaps before you call it a replacement.
- mail hosting, spam filtering, domains, calendars, contacts, deliverability, and support
- mail hosting and deliverability
- push on every platform
- advanced team collaboration
- provider-specific AI and search
Need the files? The project pack on the verdict page hands your agent the whole brief · more email.