Signals and Threads cover image

Building a functional email server with Dominick LoBraico

Signals and Threads

CHAPTER

The Early Properties of Email

Email is a thing that anyone can participate in, organizations can kind of build their own infrastructure to connect to it. So the foundations are relatively simple, but the emergent complexity of the system is actually pretty high. In some cases, it's as simple as receive the message and deliver it on to the mailbox of a user if we are the intended recipient. But in other cases, you might want to apply filtering for things like spam and viruses before we have to do expansion for mailing lists. And then this extra compliance implication makes sure that we're logging all of the right messages with all of the metadata at the right time.

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