Fast Convenient Mail for Travel: OfflineIMAP
OfflineIMAP's defaults, as illustrated with the examples above, are quite conservative. It tries to work with as many IMAP servers as possible right out of the box, so the advanced features that occasionally cause trouble are disabled by default.
If you have many mail folders or get a lot of mail in each folder, the synchronization process can be slow. This is especially true if you are using a high-latency Internet connection, such as a modem or satellite. To speed things up, OfflineIMAP is capable of establishing multiple connections to your server at once. It then is able to perform tasks in parallel. For instance, OfflineIMAP might download three messages and synchronize two folders simultaneously.
OfflineIMAP offers several configuration options. First, you should add a line such as maxsyncaccounts = 5 to your general section. This enables OfflineIMAP to synchronize multiple accounts simultaneously, which is almost always a good thing. Second, in the repository section for the remote part of each account, you can control how much parallelism to use. For instance, you might add a line saying maxconnections = 3 to the MyMailRemote repository section in our example. This allows OfflineIMAP to establish up to three connections to the server.
If you are performing continuous syncs with the autorefresh option described above, there's another source for delay. Each time OfflineIMAP starts syncing an account, it connects to the server. When it's done with that particular sync, it disconnects. Establishing these connections can be slow in many cases. OfflineIMAP provides an option to keep the connections open even between syncs. The problem is that some servers disconnect clients that are idle for a long time. To combat that problem, OfflineIMAP also can send little bits of traffic every so often to make sure the timers don't expire. To take advantage of these features, add lines like these to the remote repository section:
holdconnectionopen = true keepalive = 60
OfflineIMAP ships with many different user interfaces. The two most common are Tk.Blinkenlights and Curses.Blinkenlights. The former presents a small graphical window on OfflineIMAP's progress on your X desktop. The latter runs in a terminal and provides a nice monitor of progress (see Figures 1 and 2).
With the Tk.Blinkenlights interface, you can click on the Sync immediately button to force the account to synchronize right away. You can do the same thing in the Curses.Blinkenlights interface by pressing the number next to the account name. Both interfaces display a log of current activities. You also get a mesmerizing display of flashing status lights so you won't get bored while watching the synchronization happen.
The TTY.TTYUI interface can run without any Curses support—it uses no color or terminal controls. It can read password input, but it provides no other capabilities for interaction.
Noninteractive.Basic is a user interface designed never to receive any input from the user. It can, however, display status messages. If you need a password in order to log in to a remote server, add a line such as remotepass = mypassword to the remote repository section of the configuration file.
Finally, Noninteractive.Quiet goes one step further and does not output status messages. Some people like to run OfflineIMAP from a cron job, and Noninteractive.Quiet is good for that.
You can specify which user interface should be used in one of two ways. First, you can use the -u option on the OfflineIMAP command line. For instance, you might run offlineimap -u Curses.Blinkenlights. Alternatively, you can add a ui line to your general section, like this:
ui = Tk.Blinkenlights, Curses.Blinkenlights, TTY.TTYUI
With this configuration, OfflineIMAP first tries the Tk.Blinkenlights interface. If your Python doesn't support Tk, or if you are not running under X, it then tries the Curses.Blinkenlights interface. If that too fails, the TTY.TTYUI interface is tried. If even that does not work, OfflineIMAP aborts with an error.
|Dynamic DNS—an Object Lesson in Problem Solving||May 21, 2013|
|Using Salt Stack and Vagrant for Drupal Development||May 20, 2013|
|Making Linux and Android Get Along (It's Not as Hard as It Sounds)||May 16, 2013|
|Drupal Is a Framework: Why Everyone Needs to Understand This||May 15, 2013|
|Home, My Backup Data Center||May 13, 2013|
|Non-Linux FOSS: Seashore||May 10, 2013|
- RSS Feeds
- Making Linux and Android Get Along (It's Not as Hard as It Sounds)
- Using Salt Stack and Vagrant for Drupal Development
- Dynamic DNS—an Object Lesson in Problem Solving
- New Products
- Validate an E-Mail Address with PHP, the Right Way
- Drupal Is a Framework: Why Everyone Needs to Understand This
- A Topic for Discussion - Open Source Feature-Richness?
- Download the Free Red Hat White Paper "Using an Open Source Framework to Catch the Bad Guy"
- Tech Tip: Really Simple HTTP Server with Python
- Roll your own dynamic dns
3 hours 19 min ago
- Please correct the URL for Salt Stack's web site
6 hours 31 min ago
- Android is Linux -- why no better inter-operation
8 hours 46 min ago
- Connecting Android device to desktop Linux via USB
9 hours 15 min ago
- Find new cell phone and tablet pc
10 hours 13 min ago
11 hours 42 min ago
- Automatically updating Guest Additions
12 hours 50 min ago
- I like your topic on android
13 hours 37 min ago
- This is the easiest tutorial
20 hours 12 min ago
- Ahh, the Koolaid.
1 day 1 hour ago
Enter to Win an Adafruit Pi Cobbler Breakout Kit for Raspberry Pi
It's Raspberry Pi month at Linux Journal. Each week in May, Adafruit will be giving away a Pi-related prize to a lucky, randomly drawn LJ reader. Winners will be announced weekly.
Fill out the fields below to enter to win this week's prize-- a Pi Cobbler Breakout Kit for Raspberry Pi.
Congratulations to our winners so far:
- 5-8-13, Pi Starter Pack: Jack Davis
- 5-15-13, Pi Model B 512MB RAM: Patrick Dunn
- 5-21-13, Prototyping Pi Plate Kit: Philip Kirby
- Next winner announced on 5-27-13!
Free Webinar: Hadoop
How to Build an Optimal Hadoop Cluster to Store and Maintain Unlimited Amounts of Data Using Microservers
Realizing the promise of Apache® Hadoop® requires the effective deployment of compute, memory, storage and networking to achieve optimal results. With its flexibility and multitude of options, it is easy to over or under provision the server infrastructure, resulting in poor performance and high TCO. Join us for an in depth, technical discussion with industry experts from leading Hadoop and server companies who will provide insights into the key considerations for designing and deploying an optimal Hadoop cluster.
Some of key questions to be discussed are:
- What is the “typical” Hadoop cluster and what should be installed on the different machine types?
- Why should you consider the typical workload patterns when making your hardware decisions?
- Are all microservers created equal for Hadoop deployments?
- How do I plan for expansion if I require more compute, memory, storage or networking?