In response to: http://savannah.gnu.org/support/?108704
The root cause is that the VMs have been assigned IPv6 addresses but have not had IPv6 DNS set up for them. This causes email from savannah to be rejected by the remote hosts due to lack of a client DNS record. I don't think clients are being reasonable to expect reverse dns but the report was for gmail.com. In order to improve the situation there I have added an AAAA record for frontend.savannah.gnu.org and I asked Lisa to add a PTR record for the reverse DNS direction. This may have some unintended effects. For one I see that Nagios isn't happen with the now possible IPv6 connection and reports that frontend is down and offline. It isn't. I will debug that later, no more time for the moment. But just in case it does here is the communication about it. Bob
