Does the spam filter really work?

[ekevu123]

I have these lists added as DNSBL zones:

zen.spamhaus.org
bl.mailspike.net
all.spamrats.com
b.barracudacentral.org

But I am still getting quite obvious spam messages. I have moved a few hundred into the spam filter by now, but there doesn't seem to be any learning, I receive the same messages only slightly reworded over and over into my inbox.

Am I missing someting here? I don't know, maybe they are somehow not activated?

[nebulon]

You may have to fine-tune spam assassin to your use-cases. Cloudron comes with the upstream defaults. You can specify your own rules as mentioned in https://docs.cloudron.io/email/#custom-spam-filtering-rules

For my personal case for example the following rules have greatly improved the detection, but also increases the false-positive count slightly:

score BAYES_999 2.0
score BAYES_99 4.5

[necrevistonnezr]

@d19dotca has shared some excellent insight in this thread: https://forum.cloudron.io/post/58922

[ekevu123]

@necrevistonnezr Thank you, I will try these rules and see how it goes!

[timbo]

I also have issues with spam lately and i start to wonder if the spam filter did stop working. For my case, it does not filter anything out right now.
Also: does spam need to stay in "Junk" or can i delete sometime? Because it will fill up badly...

@nebulon said in Does the spam filter really work?:

You may have to fine-tune spam assassin to your use-cases. Cloudron comes with the upstream defaults. You can specify your own rules as mentioned in https://docs.cloudron.io/email/#custom-spam-filtering-rules

For my personal case for example the following rules have greatly improved the detection, but also increases the false-positive count slightly:

score BAYES_999 2.0
score BAYES_99 4.5

I just started using these settings and will report.

[nebulon]

Spamassasin will learn about spam with the action of moving an email to the spam folder. It is not required to keep the email there, so you can expunge the spam folder.

[ekevu123]

Using the above-mentioned rules has helped a lot for me, I couldn't find a false-positive yet at all.

But I didn't see that much learning either beforehand. However, I recommend trying these rules, they solved the problem for me.

[timbo]

@ekevu123 I am trying the rules from @nebulon - but so far no changes for me.
In fact it is getting worse every day in my situation.
I now created custom rules to also filter out all email with "rezept" "apotheke" etc in Subject etc. and in the spam folder are already almost 100 of mails like that but i receive several of these every day. makes me thinking about migrating my mails to another service. i am very much frustrated and unsatisfied by cloudrons spam filter right now.

[necrevistonnezr]

@timbo I have practically zero spam with the rules mentioned in my post and abusix DSNBL (https://abusix.com/) - the free tier is sufficient.
Do you have catch-all enabled?