Send an email.

Uses the SMTP_SERVER environment variable to configure the server to use for sending. For example: SMTP_SERVER=smtps://username:password@mail.someserver.com/?pool=true

If you don’t specify a server ethereal.email will be used and the viewing link will be returned in the url property of the result. You can use this for testing your emails in dev mode.

• to and from are valid email addresses.
• to can be an array of valid email addresses for multiple recipients.
• subject is the text of the subject line.
• Use :text for the body of the email in text format.
• Use :html for the body of the email in html format.
• Use :smtp-transport keyword argument if you want to re-use the transport to send multiple emails.
• Use :headers to pass a map of additional headers.

Create the SMTP mail transport to be used by send-email.

The SMTP_SERVER environment variable specifies the connection settings. If unset a test account at ethereal.email will be used.