This article guides readers through building a voice mail system using Twilio Studio, Functions, and SendGrid. To start, readers need to set up a Twilio account and a verified sender email address with SendGrid. They then create two Twilio Functions: one to send voicemails as emails with transcriptions and URLs, and another to send voicemails as SMS messages with transcriptions and URLs. The article also provides a step-by-step guide on how to set up a Studio flow that uses these functions to route incoming calls to voicemail. Finally, the article explains how to test the system by configuring a Twilio number and placing a call to it.