(Reuters) – Cloud technology company Twilio said on Monday it would buy email technology firm SendGrid in an all-stock deal valued at about $2 billion, combining two firms that handle communications between apps and their users. While Twilio’s technology helps its customers like Airbnb and Lyft send text and other types of messages to its users, SendGrid focuses on email. “We started Twilio by building voice, then SMS, video, web and mobile chat, channels like Facebook Messenger, WhatsApp.