Task mentions (#926)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/926
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

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)