From 07991688fbe83a5b6e3d2258bf0647fb70e9cc52 Mon Sep 17 00:00:00 2001
From: Thomas Schwery <thomas@inf3.ch>
Date: Sun, 25 Jun 2017 21:02:20 +0000
Subject: [PATCH] SMTP and IMAP tools

---
 imap-listmails.go | 78 +++++++++++++++++++++++++++++++++++++++++++++++
 smtp-sendmail.go  | 23 ++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 imap-listmails.go
 create mode 100644 smtp-sendmail.go

diff --git a/imap-listmails.go b/imap-listmails.go
new file mode 100644
index 0000000..9e7b25e
--- /dev/null
+++ b/imap-listmails.go
@@ -0,0 +1,78 @@
+package main
+
+import (
+	"log"
+
+	"github.com/emersion/go-imap/client"
+	"github.com/emersion/go-imap"
+)
+
+func main() {
+	log.Println("Connecting to server...")
+
+	// Connect to server
+	c, err := client.Dial("127.0.0.1:10143")
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("Connected")
+
+	// Don't forget to logout
+	defer c.Logout()
+
+	// Login
+	if err := c.Login("smtp", "a"); err != nil {
+		log.Fatal(err)
+	}
+	log.Println("Logged in")
+
+	// List mailboxes
+	mailboxes := make(chan *imap.MailboxInfo, 10)
+	done := make(chan error, 1)
+	go func () {
+		done <- c.List("", "*", mailboxes)
+	}()
+
+	log.Println("Mailboxes:")
+	for m := range mailboxes {
+		log.Println("* " + m.Name)
+	}
+
+	if err := <-done; err != nil {
+		log.Fatal(err)
+	}
+
+	// Select INBOX
+	mbox, err := c.Select("INBOX", false)
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("Flags for INBOX:", mbox.Flags)
+
+	// Get the last 4 messages
+	from := uint32(1)
+	to := mbox.Messages
+	if mbox.Messages > 3 {
+		// We're using unsigned integers here, only substract if the result is > 0
+		from = mbox.Messages - 3
+	}
+	seqset := new(imap.SeqSet)
+	seqset.AddRange(from, to)
+
+	messages := make(chan *imap.Message, 10)
+	done = make(chan error, 1)
+	go func() {
+		done <- c.Fetch(seqset, []string{imap.EnvelopeMsgAttr}, messages)
+	}()
+
+	log.Println("Last 4 messages:")
+	for msg := range messages {
+		log.Println("* " + msg.Envelope.Subject)
+	}
+
+	if err := <-done; err != nil {
+		log.Fatal(err)
+	}
+
+	log.Println("Done!")
+}
diff --git a/smtp-sendmail.go b/smtp-sendmail.go
new file mode 100644
index 0000000..54a875e
--- /dev/null
+++ b/smtp-sendmail.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"log"
+	"net/smtp"
+)
+
+func main() {
+	err := smtp.SendMail(
+		"127.0.0.1:10025",
+		nil,
+		"sender@example.org",
+		[]string{"incoming+1@code.sai-erp.net"},
+		[]byte("To: recipient@example.net\r\n"+
+			"Subject: discount Gophers!\r\n"+
+			"\r\n"+
+			"This is the email body.\r\n"),
+	)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+}