Email: Reply-To feature added

1. Add: Reply-To related fixes added in email.go file
2. Add: Reply-To related fixes added in emailSLS.go file

notificationmdl/email/email.go

@@ -47,6 +47,7 @@ func Init(tomlFilepath string) error {
 
 type Email struct {
 	from        string
+	replyTo     string
 	to          []string
 	cc          []string
 	bcc         []string
@@ -56,9 +57,10 @@ type Email struct {
 	plainBody   string // alternate text if template fails
 }
 
-func NewEmail(to, cc, bcc, attachments []string, from, subject, body string) *Email {
+func NewEmail(to, cc, bcc, attachments []string, from, replyTo, subject, body string) *Email {
 	return &Email{
 		from:        from,
+		replyTo:     replyTo,
 		to:          to,
 		cc:          cc,
 		bcc:         bcc,
@@ -148,6 +150,7 @@ func (email *Email) Send() error {
 	message := gomail.NewMessage()
 	message.SetHeader("From", email.from)
 	message.SetHeader("To", email.to...)
+	message.SetHeader("Reply-To", email.replyTo)
 	message.SetHeader("Cc", email.cc...)
 	message.SetHeader("Bcc", email.bcc...)
 	message.SetHeader("Subject", email.subject)