On Thu, Sep 9, 2021 at 2:18 AM Slavko via mailop <mailop@mailop.org> wrote:
> Hi, > > Dňa 8. 9. o 22:44 Brandon Long via mailop napísal(a): > > Hmm, blocking connections is highly unusual for us, as it doesn't provide > > any feedback, usually we respond with a 5xx banner or to HELO. I would > > check to see if you can reach www.google.com on IPv6 from the same box, > and > > if you can, then go ahead and send me your IPv6 address and I can > escalate > > that. > > I can ping it from that box: > > ping -ac2 2a00:1450:400c:c07::1b > PING 2a00:1450:400c:c07::1b(2a00:1450:400c:c07::1b) 56 data bytes > 64 bytes from 2a00:1450:400c:c07::1b: icmp_seq=1 ttl=107 time=32.9 ms > 64 bytes from 2a00:1450:400c:c07::1b: icmp_seq=2 ttl=107 time=31.7 ms > > --- 2a00:1450:400c:c07::1b ping statistics --- > 2 packets transmitted, 2 received, 0% packet loss, time 1001ms > rtt min/avg/max/mdev = 31.702/32.297/32.892/0.595 ms > > It is a LXC container with limited software, but here is nmap output > from its physical host: > > nmap -6p 25 2a00:1450:400c:c07::1b > Starting Nmap 7.70 ( https://nmap.org ) at 2021-09-09 10:44 CEST > Nmap scan report for wo-in-f27.1e100.net (2a00:1450:400c:c07::1b) > Host is up (0.029s latency). > > PORT STATE SERVICE > 25/tcp filtered smtp > > Nmap done: 1 IP address (1 host up) scanned in 2.57 seconds > > > Unusual means it's almost always a manual step taken in response to a > spam > > or other bad acting campaign of extremely large magnitude... but > sometimes > > those types of blocks can linger. > > Here is wery low traffic out from my MTA, and only small amount of this > outbound mails are going to gmail (<10/week), thus it cannot be massive > in any mean ;-) > > I use HE IPv6 tunnel, with /48 net, from which i use only one /64 block > yet, thus even all neighbors are under my control. I have even working > PTR for IPv6. I didn't noticed any unusual outbound traffic from my net. > Delivery via IPv4 works without any problems, thus for now i enabled > ipv4_prefer in my MTA. > These types of blocks would likely be a larger subnet than that. I can't do any investigation without knowing your IP address or net. Brandon
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