Added the ability to send with a custom TLS Config

email.go

@@ -6,6 +6,7 @@ import (
 	"bufio"
 	"bytes"
 	"crypto/rand"
+	"crypto/tls"
 	"encoding/base64"
 	"errors"
 	"fmt"
@@ -369,6 +370,80 @@ func (e *Email) Send(addr string, a smtp.Auth) error {
 	return smtp.SendMail(addr, a, from.Address, to, raw)
 }
 
+// SendWithTLS sends an email with an optional TLS config.
+// This is helpful if you need to connect to a host that is used an untrusted
+// certificate.
+func (e *Email) SendWithTLS(addr string, a smtp.Auth, t *tls.Config) error {
+	fmt.Println("Sending with T.L.S.")
+	// Merge the To, Cc, and Bcc fields
+	to := make([]string, 0, len(e.To)+len(e.Cc)+len(e.Bcc))
+	to = append(append(append(to, e.To...), e.Cc...), e.Bcc...)
+	for i := 0; i < len(to); i++ {
+		addr, err := mail.ParseAddress(to[i])
+		if err != nil {
+			return err
+		}
+		to[i] = addr.Address
+	}
+	// Check to make sure there is at least one recipient and one "From" address
+	if e.From == "" || len(to) == 0 {
+		return errors.New("Must specify at least one From address and one To address")
+	}
+	from, err := mail.ParseAddress(e.From)
+	if err != nil {
+		return err
+	}
+	raw, err := e.Bytes()
+	if err != nil {
+		return err
+	}
+	// Taken from the standard library
+	// https://github.com/golang/go/blob/master/src/net/smtp/smtp.go#L300
+	c, err := smtp.Dial(addr)
+	if err != nil {
+		return err
+	}
+	defer c.Close()
+	if err = c.Hello("localhost"); err != nil {
+		return err
+	}
+	// Use TLS if available
+	if ok, _ := c.Extension("STARTTLS"); ok {
+		if err = c.StartTLS(t); err != nil {
+			return err
+		}
+	}
+
+	if a != nil {
+		if ok, _ := c.Extension("AUTH"); ok {
+			if err = c.Auth(a); err != nil {
+				return err
+			}
+		}
+	}
+	if err = c.Mail(from.Address); err != nil {
+		return err
+	}
+	for _, addr := range to {
+		if err = c.Rcpt(addr); err != nil {
+			return err
+		}
+	}
+	w, err := c.Data()
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(raw)
+	if err != nil {
+		return err
+	}
+	err = w.Close()
+	if err != nil {
+		return err
+	}
+	return c.Quit()
+}
+
 // Attachment is a struct representing an email attachment.
 // Based on the mime/multipart.FileHeader struct, Attachment contains the name, MIMEHeader, and content of the attachment in question
 type Attachment struct {