Quote:
Originally Posted by id10t
Hosting my own mail... when I show students the logs you can see the spam flowing to the wife and daughter's accounts, and being totally rejected.
Using postfix+spamassassin with a reverse lookup black list, checking spif and/or dkim records. What little spam makes it through to my account Thunderbird then takes care of.
One technique that I use for my own stuff is to use extended addressing. Anytime I have to give my email I add the business to the address. At least this way if I start getting spam I know who's CEO address I should look up and forward that unique address to him/her.
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Agreed that Thunderbirds filtering is pretty good but requires frequent retraining.
My issue with RBLs is the emergence of what I refer to as predatory list maintainers.
It's a fairly recent, within the last year or two, problem.
There are a couple in Germany and also Australia.
They promote themselves as predictive lists. Meaning they'll add you if they THINK you may spam. They do this by monitoring other RBLs and if they see your IP block pop on even one of the 30 or so commonly known Listers bam you are in their list.
No big deal right, people get falsely blocked all the time.
Here's where the ****ery starts.
They provide no self delisting utility and ther is absolutely zero contact information available.
They will block addresses anywhere from a week to 30 days. The only way to expedite a delisting is to "make a donation". It's extortion.
I saw one of my clients clients get blocked for 3 month by the Aussie outfit.
Since most sys admins are lazy and just tick the "use RBl" feature without creating a curated RBL list you'll find yourself blocked frequently.
Not such a big deal for personal accounts but sucks big time for a business.