Twilio just spent $2 billion on a company that helps send mass emails

Twilio just spent $2 billion to buy SendGrid, a company that helps send mass emails. Shares of Twilio fell more than 4 percent in extended trading after the announcement. Twilio and SendGrid today announced that they have entered into a definitive agreement for Twilio to acquire SendGrid in an all-stock transaction valued at approximately $2 billion.