Fix from email address

pkg/cmd/testmail.go

@@ -42,7 +42,7 @@ var testmailCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 		log.Info("Sending testmail...")
 		message := notifications.NewMail().
-			From(config.MailerFromEmail.GetString()).
+			From("Vikunja <"+config.MailerFromEmail.GetString()+">").
 			To(args[0]).
 			Subject("Test from Vikunja").
 			Line("This is a test mail!").

pkg/mail/send_mail.go

@@ -72,7 +72,7 @@ func SendTestMail(opts *Opts) error {
 func sendMail(opts *Opts) *gomail.Message {
 	m := gomail.NewMessage()
 	if opts.From == "" {
-		opts.From = config.MailerFromEmail.GetString()
+		opts.From = "Vikunja <" + config.MailerFromEmail.GetString() + ">"
 	}
 	m.SetHeader("From", opts.From)
 	m.SetHeader("To", opts.To)