[ Date Index ] [ Thread Index ] [ <= Previous by date / thread ] [ Next by date / thread => ]
On 28 March 2013 10:29, Martijn Grooten <sweetwatergeek@xxxxxxxxx> wrote: > On Thu, Mar 28, 2013 at 10:10 AM, Simon Avery wrote: >> There might be something buried in the headers to show it went through >> a server belonging to a freemail provider, but I wouldn't like to >> guarantee or monitor it to ensure no ham got hung up. > > Unless I misinterpret what you're saying, it's relatively easy to > determine whether an email was sent from one of the (big) freemail > providers. The reverse DNS of the connecting IP is usually the biggest > give-away; most of these providers will also add a DKIM signature to > the emails. Actually, you're right. On thinking some more about it, I've remembered I'm currently scoring freemail providers via some standard rules in Spamassassin which are reasonably robust. > But I doubt that helps a lot here. I did some back-of-the-envelope > calculations and found that around 1% of email from legitimate Yahoo > accounts (i.e. accounts not set up by spammers) was spam as a > consequence of the account being compromised. Other webmail providers > (I checked Hotmail and Gmail) performed better than that (especially > Gmail). YMMV of course, but even if 10% of email from Yahoo were spam, > blocking them would see you throw a lot of babies with the bathwater. I don't track rejected spam other than numbers. I stopped caring so much about it some years ago since it's checked and bounced at smtp. I think we've talked this talk before in here fairly recently, but I do agree - and what is very clear with spam is that there is no one-fix solution, and whenever something like that does happen, it doesn't stay true for long. As arms races go, spam is up there as one of the fastest changing - which is why for personal mail I'm quite happy to use gmail who take care of it for me. > As to why Yahoo still hasn't solved it, we can only guess. They > probably have bigger problems to deal with. They've always been a bit different to everyone else, and made some odd decisions over the years. I'm fairly glad I've never hitched any of my wagons to them. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq