Funambol E-mail: Part 1

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In this article, Maria will set up Funambol to connect to the company e-mail server, in order to enable her users to receive e-mail on their mobile phones.

E-mail Connector

The E-mail Connector allows Funambol to connect to any IMAP and POP e-mail server to enable mobile devices to receive corporate or personal e-mail.

The part of the Funambol architecture involved with this functionality is illustrated in the following figure:

Funambol Mobile Open Source

The E-mail Connector is a container of many things, the most important ones being:

  • The e-mail server extension (represented in the figure by the E-mail Connector block): This is the extension of the Funambol Data Synchronization Service that allows e-mail synchronization through the connection to the e-mail provider.
  • The Inbox Listener Service: This is the service that detects new e-mail in the user inbox and notifies the user’s devices.

When the Funambol DS Service receives sync requests for e-mail, the request calls the E-mail Connector, which downloads new messages from the e-mail server and makes them available to the DS Service, which in turn delivers them to the device.

When a user receives a new e-mail, the new message is detected by the Inbox Listener Service that notifies the user’s device to start a new sync.

When the E-mail Connector is set up and activated, e-mail can be synced with an e-mail provider if it supports one of the two popular e-mail protocols—POP3 or IMAP v4 for incoming e-mail and the SMTP protocol for outgoing e-mail delivery.

Please note that the Funambol server does not store user e-mail locally. For privacy and security reasons, e-mail is stored in the e-mail store of the E-mail Provider. The server constructs a snapshot of each user’s inbox in the local database to speed up the process of discovering new e-mails without connecting to the e-mail server. Basically, this e-mail cache contains the ID of the messages and their received date and time.

The Funambol service responsible for populating and updating the user inbox cache is the Inbox Listener Service. This service checks each user inbox on a regular basis (that is, every 15 minutes) and updates the inbox cache, adding new messages and deleting the messages that are removed from the inbox (for example, when a desktop client downloaded them or the user moved the messages to a different folder).

Another important aspect to consider with mobile e-mail is that many devices have limited capabilities and resources. Further, the latency of retrieving a large inbox can be unacceptable for mobile users, who need the device to be always functional when they are away from their computer. For this reason, Funambol limits the maximum number of e-mails that Maria can download on her mobile so that she is never inconvenienced by having too many e-mails in her mobile e-mail inbox. This value can be customized in the server settings (see section E-mail account setup).

In the following sections, Maria will learn how to set up Funambol to work with the corporate e-mail provider and how she can provide Funambol mobile e-mail for her users.

Setting up Funambol mobile e-mail

The Funambol E-mail Connector is part of a default installation of Funambol so Maria does not need to install any additional packages to use it. The following sections describe what Maria needs to do to set up Funambol to connect to her corporate e-mail server.

E-mail Provider

The only thing that Maria needs to make sure about the corporate E-mail Provider is that it supports POP/IMAP and SMTP access from the network where Funambol is installed.

It is not necessary that the firewall is open to mobile devices. Devices will keep using SyncML as the transport protocol, while the Funambol server connects to the e-mail server when required.

Also, the same e-mail server does not need to provide both POP (or IMAP) and SMTP. Funambol can be configured to use two different servers for incoming and outgoing messages.

Funambol authentication with e-mail

One of Maria’s security concerns is the distribution and provisioning of e-mail account information on the mobile phones. She does not like the fact that e-mail account information is sent over a channel that she can only partially control.

This is a common concern of IT administrators. Funambol addresses this issue by not storing e-mail credentials on the device. The device (or any other SyncML client) is provisioned with Funambol credentials. In the previous sections, Maria was able to create new accounts so that users could use the PIM synchronization service, and in doing so, she needed to provide new usernames and passwords. This is still valid for e-mail users.

What Maria needs to do now is to configure the E-mail Connector and add the e-mail account of the users she wants to enable for mobile e-mail. These topics are covered in detail in the following sections.

E-mail account setup

To add a user e-mail account to the synchronization service, Maria can use the Funambol Administration Tool, expanding the Modules | email | FunambolEmailConnector node and double-clicking the connector. This opens the connector administration panel, as shown in the following screenshot:

Funambol Mobile Open Source

There are two sections: Public Mail Servers and Accounts.

Maria needs to add new accounts. Let’s start with her account first.

Clicking the Add button in the Accounts section opens up a new search window so that she can search which Funambol user to attach to the e-mail account. Typing maria in the Username field and clicking Search, will show you the result as shown in the following screenshot:

Funambol Mobile Open Source

Double-clicking the desired account displays a form for maria’s account details as shown in the following screenshot:

Funambol Mobile Open Source

Each field is explained as follows:

  • Login, Password, Confirm password, and E-mail address
    As the labels of the fields describe, these are the e-mail account credentials and e-mail address. These are credentials used to access the e-mail service, not the ones to access the Funambol synchronization service.
  • Enable Polling
    This setting enables or disables the functionality of the Inbox Listener Service to check for updates on this account’s inbox. When disabled, the account inbox won’t be scanned for new/updated/deleted e-mail. This disables e-mail synchronization completely.
  • Enable Push
    This setting enables or disables the push functionality. When disabled, the user will not be notified of new e-mails. If Enable Polling checkbox is active, the Inbox Listener Service keeps updating this account’s e-mail cache anyway. In this case Maria can still download e-mail by manually starting the synchronization from the client.
  • Refresh time(min)
    This setting specifies how frequently the Inbox Listener Service checks for updates on this account’s inbox. The value is expressed in minutes. The shorter this period, the more often new e-mail is detected and therefore the closer the user experience is to real time. However, the smaller this number, the heavier the load on the Inbox Listener Service and the e-mail provider. When you have only a few users, this is not too relevant, but it is something to consider when planning a major deployment.

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