31 10 | 2013

How to implement a Postfix spam trap?

Written by Tanguy

Classified in : Homepage, Debian, Lazyweb

Open envelope

Spam trap

Dear lazyweb, I am considering to implement spam traps and evaluate their efficiency. The idea as rather simple:

  1. publish some real-looking email addresses on websites, in ways that no human would use them to send legitimate mail, for instance in hidden texts, or in texts clearly stating they should not be used;
  2. when my mail server receives a message for one of these address, blacklist the originating server for some time so it cannot spam real recipients.

Read more How to implement a Postfix spam trap?

07 06 | 2013

Looking for an SPF milter

Written by Tanguy

Classified in : Homepage, Debian, Lazyweb


For email extensions such as SPF, DKIM and DMARC, I think the most flexible and portable system is the milter protocol. Originally developed for Sendmail, it is now also supported by Postfix, and it allows to “plug” specific filters in the mail server without the hassle of the previous systems like SMTP proxies.

Read more Looking for an SPF milter

17 04 | 2012

Camera with a standard USB cable?

Written by Tanguy

Classified in : Homepage, Debian, Miscellaneous, Lazyweb

Digital camera icon

Since some years, there has been a movement towards standardization: mobile devices are now using Micro-USB for data transfer and charging, and SD or Micro-SD for storage extension (except Apple of course).

One piece is lacking to this perfection, however; as far as I know, digital camera producers did realize that SD won for storage, but they do not seem to have acknowledged the Micro-USB standard yet.

Now, since manufacturers and resellers do not indicate the connector type, I have no way to be sure that this is still the case. So, dear lazyweb, do you know if, by chance, there exists a compact digital camera that would use SD cards and a Micro-USB connector for data transfer and integrated charging?

20 02 | 2012

Opportunistic SSH agent

Written by Tanguy

Classified in : Homepage, Debian, Command line, Lazyweb

To use an SSH agent, one usually has to:

  1. launch the agent;
  2. add his key to it.

The first step can be automated in the desktop or shell startup script (this is a typical use case for login shell-only startup scripts, by the way), but the second one cannot if your private key is protected by a passphrase.

Read more Opportunistic SSH agent

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