It's been about five months since Twilio's (TWLO - Get Report) $2 billion acquisition of SendGrid (SEND) closed, and CEO Sameer Dholakia has been hard at work building out a new slate of capabilities into email APIs. 

Twilio's acquisition of SendGrid added email to Twilio's existing portfolio of SMS, call center and videoconferencing-based APIs. The combination boosted Twilio's position as a cloud communications powerhouse aimed at improving customer service for businesses. 

At Twilio's annual developer conference, Dholakia announced new advertising-oriented tools that will be available to SendGrid customers. Called Twilio SendGrid ads, the tools will make it possible for customers to opt-in to an email list directly from display ads on Google (GOOGL - Get Report) , Facebook (FB - Get Report) and Instagram. 

Year to date, Twilio shares are up 43%.