Reminds me of Sendgrid. At the beginning, they were faced with using an off-the-shelf MTA (mail transfer agent) or writing their own. As a core competency, writ

Reminds me of Sendgrid. At the beginning, they were faced with using an off-the-shelf MTA (mail transfer agent) or writing their own. As a core competency, writing their own turned out to be a major competitive advantage.