First

SendMail connects to the server at addr, switches to TLS if possible, authenticates with the optional mechanism a if possible, and then sends an email from address from, to addresses to, with message msg. The addr must include a port, as in “mail.example.com:smtp”. The addresses in the to parameter are the SMTP RCPT addresses.

The msg parameter should be an RFC 822-style email with headers first, a blank line, and then the message body. The lines of msg should be CRLF terminated. The msg headers should usually include fields such as “From”, “To”, “Subject”, and “Cc”. Sending “Bcc” messages is accomplished by including an email address in the to parameter but not including it in the msg headers.

The SendMail function and the net/smtp package are low-level mechanisms and provide no support for DKIM signing, MIME attachments (see the mime/multipart package), or other mail functionality. Higher-level packages exist outside of the standard library.

package bytestrings

        import (
                "bytes"
                "io"
                "io/ioutil"
        )

        // Buffer demonstrates some tricks for initializing bytes
        //Buffers
        // These buffers implement an io.Reader interface
        func Buffer(rawString string) *bytes.Buffer {

                // we'll start with a string encoded into raw bytes
                rawBytes := []byte(rawString)

                // there are a number of ways to create a buffer from
                // the raw bytes or from the original string
                var b = new(bytes.Buffer)
                b.Write(rawBytes)

                // alternatively
                b = bytes.NewBuffer(rawBytes)

                // and avoiding the initial byte array altogether
                b = bytes.NewBufferString(rawString)

                return b
        }

        // ToString is an example of taking an io.Reader and consuming
        // it all, then returning a string
        func toString(r io.Reader) (string, error) {
                b, err := ioutil.ReadAll(r)
                if err != nil {
                    return "", err
                }
                return string(b), nil
        }
email