RFC 5551 · INFORMATIONAL · 2009

Lemonade Notifications Architecture

Overview

RFC 5551, “Lemonade Notifications Architecture”, is an Informational document published in August 2009 by R. Gellens. The canonical text is published by the RFC Editor.

Abstract

Notification and filtering mechanisms can make email more enjoyable on mobile and other constrained devices (such as those with limited screen sizes, memory, data transfer rates, etc.). Notifications make the client aware of significant events (such as the arrival of new mail) so it can react (such as by fetching interesting mail immediately). Filtering reduces the visible mail to a set of messages that meet some criteria for "interesting". This functionality is included in the goals of the Lemonade (Enhancements to Internet email to Support Diverse Service Environments) Working Group.

This document also discusses the use of server-to-server notifications, and how server to server notifications fit into an architecture that provides server to client notifications. This memo provides information for the Internet community.

Abstract as published in the RFC, via rfc-editor.org.

What “Informational” means

Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.

Read this RFC

The canonical text of RFC 5551 is hosted at rfc-editor.org. Available in TXT,HTML.

Other RFCs from 2009

Who Is Online

In total there are 70 users online: 0 registered, 64 guests and 6 bots.

Most users ever online was 1,226 on 13 Jun 2026, 3:56 am.

Bots: AhrefsBot Applebot Facebook Majestic Other Bot SemrushBot

Users active in the past 15 minutes. Total registered members: 354