On 2014-03-19, Giancarlo Razzolini <grazzol...@gmail.com> wrote: > Em 19-03-2014 09:41, Stuart Henderson escreveu: >> you have more trust in ISP DNS servers honouring TTLs than I do. if >> you can only get a dynamic IP at home and would like to host mail >> there yourself, in a machine which only you have physical access to, >> etc. (i.e. do *not* want to keep your email archive on a VPS), you >> could rent a VPS and use it as a tunnel endpoint instead. > > I don't. I do not use any of my ISP's dns servers. Also, in this case, I > have to trust the other mta's dns servers honoring TTL's, not mine.
That is exactly what I mean. You trust other ISPs, who you don't even have a business relationship with, to tell their customers/mtas to deliver your mail to the correct address... Some places deliberately place a minimum restriction on TTLs to save on bandwidth. Others do it to mitigate DNS rebinding attacks. So you can have problems caused by both good *and* bad ISPs...
