Unable to receive images in telegram

[duanedtp]

System works but i'm unable to receive or pull images from the email. I'm using this to relay motion events from my security cameras, which takes a snapshot and attaches it to the email. Is it a formatting issue?

[KostyaEsmukov]

HTML and attachments are not supported, only plaintext is being forwarded, see

smtp_to_telegram/smtp_to_telegram_test.go

Lines 157 to 186 in 8092fc3

	func TestHtmlAttachmentIsIgnored(t *testing.T) {
	smtpConfig := makeSmtpConfig()
	telegramConfig := makeTelegramConfig()
	d := startSmtp(smtpConfig, telegramConfig)
	defer d.Shutdown()
	h := NewSuccessHandler()
	s := HttpServer(h)
	defer s.Shutdown(context.Background())
	m := gomail.NewMessage()
	m.SetHeader("From", "from@test")
	m.SetHeader("To", "to@test")
	m.SetHeader("Subject", "Test subj")
	m.SetBody("text/plain", "Text body")
	m.AddAlternative("text/html", "<p>HTML body</p>")
	di := gomail.NewPlainDialer(testSmtpListenHost, testSmtpListenPort, "", "")
	err := di.DialAndSend(m)
	assert.NoError(t, err)
	assert.Len(t, h.RequestMessages, len(strings.Split(telegramConfig.telegramChatIds, ",")))
	exp :=
	"From: from@test\n" +
	"To: to@test\n" +
	"Subject: Test subj\n" +
	"\n" +
	"Text body"
	assert.Equal(t, exp, h.RequestMessages[0])
	}

Converting HTML to Telegram markup would be very complex, so I don't think adding that support would be feasible.

However, simply bypassing image attachments as telegram file uploads should be easy to implement, for that a PR would be welcome.