On 6 October 2017 at 08:59, Stefano Bagnara <[email protected]> wrote: > some of our servers are experiencing issues delivering mail to > tiscali.it/tiscalinet.it italian domains.
more details after few hours of investigations: 1) I tried an "outsider" IP that never sent an email and it did the same, so it is not only a specific IP pool, but a larger issue. 2) There is no disconnect after 30 seconds, instead the connection is stuck forever until we timeout client side (5 minutes, but I tried increasing to 30 minutes to no avail). 3) The email are indeed delivered.. around 1 minute after the "." the email is already in the target inbox even if we never got a response at smtp time: the smtp connection is still stuck and eventually time out. So, this is creating double/multiple delivery issues. Some times we eventually get an answer to the "." command after 50 seconds, but most times it simply stuck. Given the email are delivered and that there is a timeout in a state of the protocol where the RFC requires to minimize latency, I guess this is not an antispam measure, but something broken on Tiscali side.. maybe it relates to some antispam measure as some IP simply don't see any delay and are able to deliver with no issues, while others are affected. Stefano > Tiscali server waits 14 seconds at the helo, then the connection is > fast and then it stuck at the "." command and after 30 more seconds > the remote server close the connection unexpectedly with no protocol > error. This happens for all connections from a given IP pool. > > From another IP pool emails flow as usual. > > This started 22 hours ago. > > Both pools have years of good history and are not listed in (public) > blacklists. > > I never received answers from postmaster@ in past, so I try here. I > don't think anyone from tiscali is here, but maybe someone else is > experiencing/experienced something similar. Do you? > > Stefano > > -- > Stefano Bagnara > Apache James/jDKIM/jSPF > VOXmail/Mosaico.io/VoidLabs _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
