Send mails that correspond to RFC2045 with a base64 line limit of 76 …

…characters.

notifications/email.go

@@ -72,7 +72,12 @@ func (e *emailTypeNotifier) buildMessage(entries []*log.Entry) []byte {
 	for k, v := range header {
 		message += fmt.Sprintf("%s: %s\r\n", k, v)
 	}
-	message += "\r\n" + base64.StdEncoding.EncodeToString([]byte(body))
+
+	encodedBody := base64.StdEncoding.EncodeToString([]byte(body))
+	//RFC 2045 base64 encoding demands line no longer than 76 characters.
+	for _, line := range SplitSubN(encodedBody, 76) {
+		message += "\r\n" + line
+	}
 
 	return []byte(message)
 }

notifications/util.go

@@ -0,0 +1,24 @@
+package notifications
+
+import "bytes"
+
+// SplitSubN splits a string into a list of string with each having
+// a maximum number of characters n
+func SplitSubN(s string, n int) []string {
+	sub := ""
+	subs := []string{}
+
+	runes := bytes.Runes([]byte(s))
+	l := len(runes)
+	for i, r := range runes {
+		sub = sub + string(r)
+		if (i+1)%n == 0 {
+			subs = append(subs, sub)
+			sub = ""
+		} else if (i + 1) == l {
+			subs = append(subs, sub)
+		}
+	}
+
+	return subs
+}