On 12/11/2009 03:20 PM, Greg Woods wrote:
On Fri, 2009-12-11 at 18:02 -0500, Tony Nelson wrote:
there is no requirement that a domain have an A record to exchange mail
True, but there are plenty of mail servers (including sourceforge.net) that verify DNS information by back connecting. The domain therefore has to either have an A record, or an MX record pointing to a server that does have an A record, and the server the MX points to (or A if no MX) must be reachable on the SMTP port. We have found this out because we modify all MX records to point to our gateway, and we've had people send mail out from machines we weren't told were mail originators (and therefore they have no MX), and since the SMTP servers on these machines are not reachable from outside, mail servers like sourceforge.net refuse to accept mail from these hosts. So it is possible to have your outgoing mail rejected due to DNS inconsistencies.
--Greg
Well, I did some digging.
One instance where this happens is the following.
If I send this to my own "user@fedoroproject.org" account, from my account here (which is were it gets forwarded back to anyway), then I see this behavior.
If I sent this to the same account from a 3rd party server (gmail, etc) then it works fine.
Very, very odd.