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Comments
apt-get remove postfix
Blocking specific IP ranges?
im using spamexperts. works good.
Short of alternatives that exist to do the same as what you mentioned, like third party services, not sure what else there really is to have as a strategy. RBLs, I suppose.
Dspam is the most powerful free software which we setup for customers. Shady centralized blacklists like "dnsbl" should be avoided, especially the spamhaus ones.
http://efa-project.org is an excellent applinace
haraka or rspamdm and of course dnsbl, with a great trust to spamhaus.
MxToolBox ?
Just for the record, I wanted to reply to this thread, and Cloudflare doesn't let me. @mpkossen
Maybe the OP can figure out some bits of what I wanted to post, in that mess.
stupid reply (not being serious): this is a great idea to weed out all those pesky invoices for dedicated servers and hosting accounts
Technically you're right.
I insist: technically.
Spamassassin has many plugins
I used setup as this on my cpanel servers and it blocks over 90% of the spam
http://technotes.trostfamily.org/?p=184 (it has non cpanel exim version too but the post is older)
Connection Management:
Step 1 – Network Denial of Service Protection (Upling takes care of that)
Step 2 – Exim Rate Control +
Step 3 – IP Reputation Analysis + (I added my Mail server ips to barracuda to use their RBL, also there was an issue in the past when querying spamhaus trough free name servers so as i use csf i just enable spamhaus as a lfd block list)
Step 4 – Recipient Verification +
Step 5 – Sender Verification + ( the light option Sender Verification no callouts)
Content Scanning:
Step 6 – Content (Virus and Spam) Scanning +
Step 7 – Custom Policy +
Step 8 – Fingerprint Analysis + (I'm not paranoid enough to run all 4 plugins but run 2 cPanel now has enabled pyzor by default but I like DCC so I addit remember to open ports in firewall if required
Step 8 – Intent Analysis + (enabled by default in cPanel spam assassin ...)
Step 9 – Image Analysis - (plugins are too old so i skip that)
Step 10 – Bayesian Analysis - skipped (never seems them to work as expected)
Step 11 – Rule-Based Scoring - default no auto delete over the score bur forced spam assassin
that filters 95+ 98% of spam think it is close to better than spamexperts
For outgouing ratelimits with allerts to investigate (im not too email friendly provider)
Probably too much symbols in your reply. Filter is sometimes a bit strict about that.
I don't use any anti-spam additions to my email server. I simply use disposable email addresses, and I invalidate them if they ever get into the hands of spammers. I don't do anything for outgoing email, either, because I'd have bigger problems if my server were compromised by spammers.
Gmail lol
Greylisting. It's only useful for incoming mail.
Large portions of spam are sent by malware-infected computers. Their SMTP engines are often incomplete, lacking retry capabilities, so failed spam won't get retried again. Greylisting uses this to separate real mail servers from spam-sending zombie PCs. Greylisting is resource friendly, and usually reduces the workload put on more heavy backend processing like SpamAssassin.