Apologies for writing in English, but my German is not good enough.
This isn't technically a plugin, but does interact with Spamihilator anyway.
The idea here is that anyone I send an email to is not a spammer, so what this utility does is scan every outgoing email and adds all the recipients to the Spamihilator Friends list. It does this by using to act as an SMTP proxy, in much the same way as Spamihilator is behaving as a POP proxy.
You configure your email client to use localhost as an SMTP server, and configure this utility with your actual SMTP server details.
Ideally, of course, this SMTP proxying functionality would be built in to Spamihilator, but as it is not, this will do the job.
An Installer/Uninstaller is provided. The .net CLR runtimes are required (the installer will give you the option to download and install them if they are missing).
Source code in C# (and NSIS for the installer) is included.
I hope you find this useful, and comments and suggestions are always welcome. Once I'm happy that people are finding it stable and bug-free, I'll list it in the Plugins section of the website.
Alex