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Do you have any evidence for this? It seems unlikely to me...
by mike-cardwell 13y ago
Do you have any evidence for this? It seems unlikely to me...
- mike_hearn 13y agoHe's talking about something called the PBL (policy blocklist). The idea is it contains IP ranges that aren't "supposed" to send mail, like consumer ADSL ranges. People who want to send mail from home directly are supposed to do so via their ISPs SMTP servers, which may be configured to relay but only from IPs the ISP controls.
- mhurron 13y agoThere is no reason you can't set up your SMTP server to use your ISP, or other SMTP service like gmail, as a smart relay. Personally I have a VPS that I relay mail through.
- 0x0 13y agoOne downside with ISP outbound relaying is SPF; if you want to use it you need to figure out how mail exits the ISP and keep the SPF records up to date; and even if you do, suddenly all the other customers of that ISP can fake mail from you while passing SPF. Another downside is you lose logs of and insight in the mailq and the recipient smtp server responses.
- mike-cardwell 13y agoI am familiar with the SpamHaus PBL. It was my understanding that anyone could easily remove their own IP address from the list if required? Presumably that is what happens when Rackspace customers want to send legitimate mail. So why would it cause any problems for spammers?