Re: [bitfolk] Email - getting out of spam filters

On 30/07/2013 18:21, Jan Henkins wrote: If you think that's bad, then consider that there are a significantly non-zero number of domains that actually explicitly use +all, which as far as I'm concerned is tantamount to declaring 'all spammers in the world may use my domain freely'. http://spf-all.com/stats.html In my mail setup I normally allow domains that pass SPF to skip greylisting, but I have an explicit check for +all which treats it as neutral and falls through to greylisting. Interestingly, I'm starting to see greylisting become less effective as an anti-spam technique. Traditionally greylisting works by temporarily rejecting mail on the first delivery attempt on the assumption that genuine MTAs conform to the specs and will attempt to resend a short while later, while spambots will simply give up and move on to the next target. A few years ago nearly all of the small amount of spam I got was from hosts which passed SPF (presumably either through compromised systems or through loose SPF settings). Nowadays most of my spam is SPF neutral, which in my mail setup gets greylisted. This means that these spams are getting through greylisting, so there are now some spam networks out there which have clued on to this. -- Phil