E-mail without sender

[admin]

The code in the example was incorrect. From header must be placed together with to and subject:

Code:

settings.source = smtp.message({
  headers = {
      to = table.concat(to, ', '),
      subject = subject,
      From = '<' .. tostring(settings.from) .. '>',
    },
...

If needed, you can add a name before < in the header so it's displayed together with the email address.