Email has never been as simple as most people think it is. But if you need to connect a cloud application or an office photocopier to your organization email, SMTP relay can be pretty easy to set up--if you know how!
EXTRA CREDIT:
- SPF is only one of the two ways used to validate an email's source. The other method is DKIM. That's typically set up on the central mail server, so relaying through your organization's server allows the correct signature to be added.
- SPF and DKIM together are used as part of DMARC, which allows your organization to tell others how to deal with any email that claims to be from your organization but doesn't pass the validation checks.