Ubuntu

S/MIME signature with Mozilla Thunderbird

This article describes how private emails, which are written in Mozilla Thunderbird, can be signed before they are sent by the author. For this purpose, S/MIME (Secure/Multipurpose Internet Mail Extensions) is used, to encrypt and sign emails by X.509 standard.

In order to obtain such a certificate for signing emails, there are a few free CAs (Certification Authority). Here Comodo is used as CA, which offers this service free of charge for private use. Comodo confirms with a signature the authenticity and identity of the owner, for which the certificate is issued.

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Lenovo X121e – Enable WiFi after login

When I boot my Lenovo ThinkPad X121e (Intel® Core™ i3-2367M CPU @ 1.40GHz × 4) with Ubuntu 11/10 or 12/04 LTS, wake it up from standby or hibernation the wireless connection is always disabled.

I can enable it by right-clicking on the network manager icon in the panel and click on “Enable Wireless”. After I’ve done that the wireless works flawlessly.

I’ve been looking for a solution for it, especially since it is not clear to me whether this is an error in the network manager. After some research on the Ubuntu forum, I found an interesting thread, which describes the solution for my problem.

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Synchronize SOGo calendar with MozillaThunderbird

Calendar details including appointment dates, which were generated with the Open Groupware-System SOGo, can be integrated into Mozilla Thunderbird (Version 10.0) without any problems and synchronized automatically. Thunderbird has to be extended with the Add-on “Lightning” (Version 1.2) thereto. The necessary steps are explained below:
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Synchronize SOGo contacts with MozillaThunderbird address book

Contact details from address books, which were generated with the Open Groupware-System SOGo, can be integrated into Mozilla Thunderbird (Version 10.0) without any problems and synchronized automatically. Thunderbird has to be extended with the Add-on “SOGo Connector Thunderbird extension” (version 10.0) thereto. The necessary steps are explained below:
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