I hate spam. I really hate spam. I guess everybody can relate to that. I not only hate spam, but I don't like receiving correspondence from some website that made me register to view some content or post a message, some site that that I've ordered from or any other place that I've had to divulge some contact info in return for something that I wanted/needed.
Honestly I only ever receive spam in my work email addresses. In the past 3 or 4 years, I've received a total of perhaps a dozen spam messages to my personal email address (which won't be listed here for the most obvious of reasons). :) So mostly I just want to get rid of 'legitimate spam'. bah!
The best way I know of to ferret out those weasels that release my email address to 3rd parties is by configuring postfix to accept mail for my so-called throwaway addresses. It's easy to do and requires but a single parameter in /etc/postfix/main.cf:
recipient_delimiter = +
Yep, that 1 magic line is all I need to make my life easier and my inbox cleaner. At the same time, it exposes those companies that play fast and loose with my address.
After I insert that config line, I restart postfix and that's all there is to it. Now when I register, for example, at the New York Times to read some stories, I can submit an email address such as:
firstname.lastname@example.org (example.com being replaced by my real domain of course)
I don't need to go into my server and create a user or anything else so long as there is a 'david' user already there. When my mailsever gets the reply from the New York Times to confirm my address, I'll see that it's To: email@example.com and it will be delivered to my david inbox.
If later I start getting spam addressed to david+nyt, then I know the source. :)
If a single address gets out of hand and starts sending me spam, I can just go in and block that so it never gets to my eyes. Good stuff that!