Recently there was an internal email thread on which SMTP server to use in demos. I thought I'd share the comments from that thread: * Person 1: I tried gmail  (smtp.gmail.com, port 465) this morning, it works fine. To use gmail, you must enable 2-step verification for your google account and generate App password. * Person 2:  I use   * Person 3: I, too, use hMailServer as a local SMTP server on my demo VMs, with a mail client (usually Outlook) also on the VM. So no need to connect out to an SMTP server on the Internet. Saves a lot of hassle and risk.