>> The solution for people on dynamic addresses (typically with some >> generic and non-matching PTR record, though I haven't checked yours) is >> likely to relay out through your ISP's mail server. > > because of the way the DNS is put together, PTR records cannot be relied upon. > ownership of the DNS entries for a name are unrelated to the DNS entries for > the in-addr > entries for a set of IP addresses to which they map.
while true, this doesn't change many large site's email practices. many do check reverse mappings. (i don't recall particular sites.) barracuda boxes check reverse ip mappings. rfc 2317 allows arbitrary cidrs to be delegated. so far, i've always been able to get reverse mappings set up for static addresses. - erik
