When it is the sole supported SMTP server for the most popular hosting panel, cPanel, it's going to be heavily used even if it was awful on all other fronts (an

When it is the sole supported SMTP server for the most popular hosting panel, cPanel, it's going to be heavily used even if it was awful on all other fronts (and from other comments, it sounds to be pretty good... other than security, which is a big deal). Interestingly, other panels seem to use other SMTP servers: https://www.liquidweb.com/kb/comparison-of-the-four-major-server-control-panels/ https://www.liquidweb.com/kb/comparison-of-the-four-major-se...